There are no flights from anywhere in Mexico to anywhere in Belize.

You could do a roundabout - Mexico to Guatemala or Honduras (on Taca) then onward to Belize City (from Guatemala on Tropic, not sure about Honduras). You would then have to get another plane (Tropic or Maya Island) or take the water taxi to either of the Cayes.

A total waste of time and money IMO.

Just updated the low budget hostels web page around Belize.
This is intended mostly for the hostel adventurer type in their 20's and 30's. There are now six hostels around Belize and a lot more so- so could be types.
You can stay busy in Western Belize out of Santa Elena Town for eight days and never repeat an adventure.

http://folkmusicfl.tripod.com/hostelsandhotelsinbelize


Ray Auxillou
http://folkmusicfl.tripod.com/adventuresinbelize

Hmmmn! We just had a group of 5 adults from Minnesota stayed two nights and chose TIKAL for one day and the Actun Tunichil Mucknal cave trip for the other. They had flown into Cozumel and bused down to Corozal, spent overnight and took the water taxi to San Pedro and promptly took another water taxi to Caye Caulker. I picked them up in town on the coast a hundred miles away when they came in from Caye Caulker. From me in Western Belize, I delivered them to the port again and they were going to do Ambergris Caye before returning the same way back through Mexico to Cozumel. In Belize, they were doing different adventures every day on a 7 day trip.
Depends on how tight your time is? Here is a website which lists SEVEN hostels around Belize for low budget sightseeing and adventuring. http://folkmusicfl.tripod.com/hostelsandhotelsinbelize
There are too many attractions and adventures to complete in less than maybe eleven months. You would really have to be choosy with your time and interests.

Ray Auxillou
Falconview Tourist Backpackers Adventure Hostel
Western Belize

Pedro's Inn does not have dorm beds but self contained,lockable rooms containing a bed.These rooms have shared bath rooms while the more expensive ones come with tv

The bar is a full service bar and we according to our supplier are responsible for drinking 59% of the jagermeister sold in Belize.