"Beaches" is a relative term. "Really no beaches on Ambergris Caye" is not "really" accurate IMO - it is an island with lots of beautiful sand and much of it is along the sea shore. I would choose it over Daytona beach, for example, everytime.
Age, preferences, PRICE Range info would all help narrow your choices down. Some Beachfront areas are raked and cleaned daily other areas are not. More seclusion North of the river and less boat traffic if you are seeking to lie on the beach or dock for sun. If you want South you can still find some seclusion and be able to walk the beach and find your favorite spot to hang.

PSUhorty I think you are refering to the "Queensland" territory along the seashore, and it is public access for walking anywhere you would like. Many people walk the beach front instead of the streets. I love watching the school children going to & from along the beach. Wish I could have done that!
Belize it!