Jah!
There aren't any dedicated addresses on CC.
Just bring your offering to either the Town Council or ask a local.
If you plan to ship, just address it to:
Caye Caulker Town Council
General Delivery,
Belize, C.A.
Mail is boated in from the mainland. If you ship send USPS air post (best rate) and remember that duty is charged on goods from abroad. You can write off the donation, cost of shipping + duty fees on your tax return.