Day 5: Caye Caulker. If you only have 7 days this will need to be a pretty full travel day make sure you have arrangements to get off the island. Either with King Leweys or with the boatman from the pier. You will need to take the same route back DO NOT take the enticing coastal highway. This is a dirt path and may have a bridge washed out. Go back on the hummingbird highway and stop at the Country Barn where Mennonites have a welcoming scoop of creamery fresh ice cream waiting for you. Continue on and return your car if you rent from Crystal they will take you to the ferry port at no charge. There are plenty of ferries from Belize City to Caye Caulker. On the island there are a lot of choices for places to stay or you can go across the split to KoKo King if you want to be away from everything. We did not stay here but there is a free boat that will take you for an afternoon coctail.
Day 6: Snorkeling and Exploring. Head into town if you are up early grab a coffee inthe swings at Ice and Beans and arrange a snorkel trip to Shark Ray Alley There are plenty of outfits that will take you here and to the reef for a half day of snorkeling. If you stay on the island it is likely your hotel will include a bicycle ride up to the Split to see the action or stop off along the way for some live music at one of the restaurants. While exploring be sure to swing by the soccer pitch as there are often matches either pick up games or more formal games to cheer alongside the locals.
Day 7: Return home check the ferry schedule and head back to the airport. The transfer is pretty easy.
Here is a quick video of the recommendations listed here