HK is generally not a difficult city to explore on your own. The signs are clear, abundant and in English as well as Chinese. Public transportation is great and cheap. Taxis are not outrageous although language will become your challenge if you dont speak Chinese or Cantonese. Although I pride myself as a frequent and experienced traveller, I still bought this DIY tour as I am bringing my mom along on this trip. The tour offers the most comprehensive routes to explore key islands and sights in HK without you having to do much works except to decide when, where, if any, to get on and off on each route.
For those of you familiar with the hop on hop off bus concepts in other cities, this is pretty much the same. For a newbie customer, this is not a typical tour with the live tiur guide but rather a bus system with very well plotted routes and recorded audio that takes you to major sights across 3 islands of HK. You have either 24 or 48 hours to hop on or off at any of their stops. There are 3 routes (blue, green, red) which covers different paths and some overlapping boarding points that allow you to cross between routes. Once you get off, The next bus comes every 30 mins or 1 hour depending on the route you are on.
1) if you know for sure that you want to see as many sights as possible and you have enough time, buy the 48 hours ticket vs. 24 hours. It is only slightly more expensive (check final price on their website) but will give you FAR more values including a) a free 1.5 hr night tour in KowLoon, b) a 1hr ferry cruise in Victoria harbour (you choose from different time slots) and of course c) double your ride timing to cover 48 hrs which is enough to see all routes.
2) if you know for sure you will do this tour on certain dates, buy the tickets online as it will save you money than if you try to buy it on the spot. I saved $16 per 2 people. The rates vary depending on your dates too.
3) we did the following itins and it worked out well. Start out with the red route (HK) early in the morning...pick selective spots to get off, then we switched to the green route (Stanley and Aberdeen) and ended around 5 pm at the peak tram station. We went up the peak and down by 6.15.....waited for the night tour bus which also picks you up there and cross to Kowloon side for the night light tour. The tour also ended at the famous and must see spot of Avenue of the stars right on time (8pm) when the free nightly light show "symphony of lights" starts. Then, you can use the following day for the blue route in Kowloon. It is productive but can als be exhausting....so pace yourself.