Just returned home after a week at Sueno del Mar. The location of the resort is superb. The rooms were perfect - clean and comfortable. Most importantly, every staff member we encountered during our stay was friendly and helpful.
On arrival at the resort we were greeted on the dock with a welcome drink. During our stay we swam, fished and snorkelled from the dock and took the hotel kayaks out to the reef. The staff were extremely attentive to our needs - providing bait for us to fish, ensuring we were comfortable with equipment etc. - nothing seemed too much trouble.
The resort offers a number of day and half-day trips. We took one to Hol Chan and Shark Ray Alley where we swam with turtles, rays and sharks. It was an amazing day.
Many reviewers have commented on the location and it is true that the resort is located a little distance from San Pedro (approximately 30 min by boat). However, transport into San Pedro was never a problem for us and we enjoyed being a distance away from the town. We took advantage of the scheduled boat services from the hotel, (as they meet arrivals and drop off departing guests), to get free rides into town.
Guests have also commented on the Wifi service and whilst it is a weak signal, we were easily able to connect from numerous areas of the resort including our room.
I would highly recommend Sueno del Mar - the location is amazing and the staff ensure that your stay is memorable.

My 15 year old daughter and I spent 2 days in Sueno Del Mar the week before Easter. We had an excellent time. The rooms were beautiful and comfortable. We stopped in town at the grocery before our boat ride over. We rode bikes, bathed in the sun, were greeted by an iguana poolside, played water volleyball with the other guests and enjoyed the beauty of the resort and the beautiful view of the water. Noel was a wonderful activities director. He took us snorkeling and out sailing on the Hobie Cat. He was a nice young man and really made our stay the best! I highly recommend Sueno Del Mar. Wonderful staff, lots of activities and great memories.

Sueno del Mar is set on the beautiful Caribbean within site of the fabulous Belize barrier reef and just south of the Bacalo Chico Marine Reserve. Great snorkeling, fishing, and boating. The grounds are beautiful and immaculate, and the condos very nice and clean. The staff is the best, including Carlos, Jose I and Jose II, Harrison, and Mark the manager, among many others. The staff will show you how to snorkel, sail, fish, and hunt for conch and lobster. They will clean your catch and the restaurant staff will prepare it for you. The complex has 24 hour security and is very safe. There are numerous excursions that you can arrange directly at Sueno which can be led by the staff or others to take you inland to distant locations like Lamanai where you can see Mayan ruins. All of the many trips are worth it and highly recommended.

As indicated in other comments, Sueno is not close to the hub-bub of San Pedro. This has many advantages, but does make it more difficult to shop or eat at various different restaurants if that is your emphasis. Nature, the beauty of the Belize barrier reef, and great people are what Sueno is all about. And yes, there are bugs at various times. But all wild and undeveloped locations have some.

First timers to Belize: THIS LOCATION IS WAY WAY FAR FROM CIVILIZATION!

Beautiful resort, with great staff. Food at restaurant is very good, which is important because not many options.

The good: Staff, room size, room amenities, cleanliness, resort grounds, free use of equipment for water activities, nice clean pool.

The bad: mosquitoes and sand fleas (flies?)! My legs are covered with welts from being bitten each night, even with OFF and baby oil (recommended mixture). Only way to get anywhere is by boat, and boat, in low season, doesn't even run every day. (I have suggested they coordinate with nearby Tranquility Bay to at least offer a morning and evening boat round trip to San Pedro. The folks I mentioned this to actually said it was a good idea and will take to management).

So although without the remoteness and feeling of being trapped, I would have given this resort a 5 STAR but going there single for a dive weekend, this was a big letdown as other than the wonderful couples I met at the resort and nearby Tranquility Bay, I was disappointed at how remote and isolated I felt during the visit.