I used Belize Tradewinds. They are a wholesale travel agency and ONLY do air, tours, trips to Belize. They have an office stateside in Wisconsin. What I liked about it, is they also have an office in San Pedro. We were very well taken care of, saved us a bundle, and they were very patient and knowledgable. You can email them at firstname.lastname@example.org or you can call toll free at
1-800-451-7776. We thought they were wonderful. Ask for Greta.
Their web site has sample tours to look at, but you can custome make your trip to fit your budget and interests. That's what we did, and we weren't disappointed. Good luck.