We used UpClose Belize because had a desk in the lobby of the hotel where we stayed in Belize, and we couldn't be more thrilled with the experience.
We did three days worth of tours that included the Blue Hole flyover (amazing!), snorkeling, the Altun Ha ruins, cave tubing, the Belize Zoo, horseback riding through the jungle and a tour of Belmopan. Tristin and Cassie both did a wonderful job taking care of us and setting us up on the best possible tours, always tailored to our group's needs; they made sure we got everywhere we needed to be and made everything super easy for us. And all the recommendations they made turned out great, because there wasn't a single thing we did that we didn't completely enjoy.
We also had the same guide for two of our days, Auner, and again we couldn't have been happier with everything he did for us and how much fun we had; after the first day of touring we had with him, we requested him for for the next day as well! He was full of knowledge about Belize and its history, as well as all of the sites we went to. Auner also gave us a bunch of recommendations for spots to eat and other things to do that all worked out really well, which was above and beyond what we expected.
Overall: a great group of people to work with if you're looking for adventures in Belize!