Bring sunscreen. Belize is famous for its sunny weather and warm temperatures; bring sunscreen and appropriate warm-weather gear to protect you from the sun. You might consider a hat, long-sleeved linen shirts, and long, light skirts. When choosing a sunscreen to pack, go for one with a high SPF to ensure the best sun protection. Nothing will ruin your week in Belize faster than a blistering sunburn.
Pack for the beach. One of the most popular activities in Belize is simple: relaxing on the beach. Pack a variety of swimsuits to keep interest during your week in Belize, and don't forget cover-ups for your walk to and from the beach. Bring a comfortable beach towel, but leave the beach toys at home; your hotel will likely have most of the equipment required for water sports.
Consider possible activities. Popular activities in Belize include diving, swimming, fishing, snorkeling, caving, and hiking. When packing for a trip, think about the things you might do. Remember to bring sturdy hiking shoes for trips to Mayan ruins, jungle tours, or walking around cities. If you plan to camp on one of the islands off of Belize's mainland, bring a sleeping bag, mosquito netting, and basic camping equipment.
Remember essentials. Although you can purchase many necessities while in the country, you will want to bring most necessary items with you. When you are on the islands or in remote locations, it can be hard to find your favorite American products, and you may not want to settle for the Central American equivalent. Tampons, shaving supplies, deodorant are examples of items that can be hard to find in Belize.
Pack for transportation options. Transportation in Belize can be notoriously dirty, bumpy, and packed. If you take water taxis or small planes, space for luggage is limited, and your bags will not be treated delicately. Be sure to take bags that are sturdy and can withstand rough treatment. Consider also the weight limits of small planes and boats, and also the major airlines you take to reach Belize.