According to forum posts, bus services are common in Cambodia, with companies like Giant Ibis and Liang US Express operating routes between major cities such as Phnom Penh, Siem Reap, and Battambang. Travelers have noted that direct buses may not always be available for less common routes, such as from Mondulkiri to Siem Reap, but connecting services via Kompong Cham are possible.

Some travelers have highlighted the availability of minivan services, which can be arranged via hotels or guesthouses. These services are noted for their convenience in picking up and dropping off passengers directly at hotels.

For routes not served by buses or vans, local forum members have suggested private taxis or arranging transport through hotels once on the ground. This can be particularly useful for travelers looking to customize their journey or make stops along the way.

Cambodia offers various visas on arrival, including the Tourist Visa (Type T) at $30, the Ordinary Visa (Type E) at $35, and several other types (Types B, K, A, C) that are gratis under specific qualifications. Payment for these visas must be in cash in USD.

According to forum posts, travelers can apply for these visas upon arrival at any Cambodian international airport or border crossing. It's essential to have a passport with at least six months validity and two unused visa pages. No photos are required for the visas, but tourists usually need to fill out an immigration card and a customs declaration form.

For those preferring to arrange things beforehand, an official e-visa can be obtained through the Cambodian government's website (www.evisa.gov.kh). This e-visa is valid for entry at specified airports and land borders.

Some travelers noted that while there are no compulsory vaccinations for entry, a yellow fever vaccination certificate might be required if arriving from certain countries. A tourist visa can be extended once for another 30 days for a fee of $45.

Some travelers have recommended exploring Angkor Wat by bicycle, noting that the route to Angkor Wat is safe for biking. This allows for a combination of exercise and sightseeing, providing a leisurely pace to take in the scenery and architecture.

For more in-depth exploration, hiring a guide has been suggested. Guides can offer insightful commentary and historical context, enhancing the experience at Angkor Wat. Travelers can arrange for guides at the site or through their hotels, and prices may vary.

Another popular option is hiring a tuk-tuk for the day. This method is cost-effective (around $15 to $20 USD for a full day) and offers flexibility, with drivers often knowledgeable about the best times and spots to visit within the archaeological park.

According to forum posts, the US dollar is the most recommended currency for travelers visiting Cambodia. It is widely accepted for most transactions, particularly in tourist areas. Travelers can obtain US dollars from ATMs throughout Cambodia, which dispense both dollars and the local currency, Cambodian Riel.

For smaller purchases, travelers will often receive change in Cambodian Riel, as highlighted by some travelers. It's important to note that while Riel is used for minor transactions, it is practically non-convertible outside of Cambodia. Therefore, it's advisable to spend any Riel before leaving the country or to convert it back to dollars while still in Cambodia.

Some travelers advised against bringing Riel from home since it's not available outside Cambodia and suggested exchanging or withdrawing dollars directly in Cambodia for better rates and convenience.

Some travelers recommended spending 3 to 5 days in Siem Reap to explore various attractions thoroughly. A 3-day itinerary is common to purchase a 3-day pass to Angkor Park.

According to forum posts, an effective 3-day itinerary in Siem Reap could include visiting the temples of Angkor Wat and Angkor Thom, exploring local markets, and enjoying the food scene. Day trips, such as visiting Kulen Mountain or the floating villages like Kampong Khleang, are popular among travelers.

For those extending their stay, users suggested including cultural experiences such as watching traditional dance shows, participating in a cooking class, or exploring the Angkor National Museum. Nature excursions, like hiking or visiting waterfalls at Kulen Mountain, were also highlighted as worthwhile.

To obtain a Cambodian eVisa, travelers should apply online via the official website www.evisa.gov.kh. The application requires a digital passport-size photo, a valid passport with more than six months remaining, health insurance, and relevant documents like an employment certificate or sponsorship letter if applicable. A valid credit card is necessary for the payment of the fee, which totals USD 42 including the processing charge.

The supporting documentation for an eVisa includes items such as health insurance, evidence of an investment project or employment, and a digital photo in JPEG or PNG format. The total cost for applying is USD 35 plus a USD 7 processing charge.

Once issued, the eVisa is valid for 3 months. Some travelers have experienced issues with incorrect details on their visa or delays in the processing time. In such cases, attempting to correct details via the website or contacting support through provided email addresses is advised, though responses may vary.

According to forum posts, currently, there are no direct flights operating from Siem Reap to Sihanoukville. Travelers exploring flight options have not found any available, suggesting limited air travel connectivity between these two cities.

Some travelers have discussed various ground transportation options for the Siem Reap to Sihanoukville route. Recommendations include checking with accommodation providers in Siem Reap for transfer services, though it's noted that the journey is considerably long even with improved roads and the new expressway. Taxi services are available, costing around $65 and taking approximately 5 hours as per user experiences shared on the forum.

For those considering bus travel, the journey from Sihanoukville to Siem Reap via a sleeper bus service by Giant Ibis has been mentioned. This service is noted for its comfort and reliability, providing amenities like pillows, blankets, and water, although some travelers advise choosing top bunks for window access.

According to forum posts, the Palace Gate Hotel is highly recommended for its superb location and quality dining, located near prominent tourist attractions and considered safe for travelers. The Pavilion is another favorite with its private plunge pools and central location, offering a peaceful yet connected experience in Phnom Penh.

For those looking for budget-friendly options, the Blue Lime and Plantation hotels have been mentioned as favorites among regular visitors to Phnom Penh. Both hotels are praised for their good service and central locations, making them convenient bases for exploring the city.

Travelers have also highlighted Villa Borann for its quiet atmosphere and beautiful setting in an old French villa, providing a more intimate and serene stay. For those traveling with family, the Kabiki is noted for being child-friendly, although it is situated a bit farther from central attractions.

Many users emphasize the importance of staying within a kilometer or two of the Royal Palace to remain close to most restaurants, bars, and the central market, suggesting this area as one of the best locations to stay in Phnom Penh for convenience and safety.