We did our own . To Calker Cay.
Truly one our favorite spots. For 17.50 RT you can take a watertaxi. A 45 min boat ride.Once you arrive walk right to the split. It`s where the island was split in two be a hurricane in 1961.
Bring your own beach gear. There is a beach bar called the Lazy Lizard. Good snorkeling and swimming.
Find the info on Belize sites.