If you are an U.S. citizen a visa is not required but all visitors must have a valid passport. Visitors from countries other than the U.S. should check with the Belize Embassy nearest to you for current regulations pertaining to them. Customs Duty free importation is allowed for baggage accompanying passenger, wearing apparel, jewelry, binoculars and cameras.
All businesses accept U.S. currency.
Some smaller places don't accept credit cards so bring travelers checks or cash. You are in the tropics so bring cool comfortable clothes - preferably cotton. Essentials include bathing suits, sandals and sturdy shoes for walking or hiking. After a day in the sun, the cool Caribbean evening breezes can feel quite chilly so bring a light long-sleeved shirt or jacket just in case. Sunglasses, a hat and tanning lotion are advisable as the sun reflecting off the white sand and clear water can be quite strong.