Where were you going? If its anyplace besides Ambergris Caye or Caye Caulker, there is no reason to change your plans.
If your destination was one of these two cayes, you should probably get in touch with whoever booked the land part of your trip. If you booked direct through the net, you should have no trouble getting a refund. Check out Placencia Peninsula, all the hotels and resorts there are undamaged and waiting for guests, you will have no trouble getting reservations at one of the many lovely places and its also a beach environment. Look at the links to the other parts of belize on this web site to see them. A couple are www.rumpoint.com
and there's lots of others. Or if you booked through a travel agent, call the agent right away.