I believe most dive shops do charge for snorkelers, not as much as divers, but quite a bit because snorkelers take up a seat on the boat as a diver, the only difference is the gear. It is about a 1 1/2 hour ride on a speed boat. It is best if it is a calm day. What is nice about the Blue Hole trip is that there are usually two other dive and snorkel stops and a visit to Half Moon Caye, a protected bird sanctuary. It is beautiful.