We will be back in San Pedro in late January. We are not divers but enjoy snorkeling. Is it possible to arrange snorkeling at sites other than those that are generally listed such as Hol Chan and Mexico Rocks?

Find an independant operator who will do a custom snorkeing trip.
Highly recommend a day trip to Rocky Point with snorkel stops en route, and a beach bar-b-q.
South of SP Coral Gardens is a good spot; up north Basil Jones is interesting. If you are adventurous go up to Bacalar Chico area - long boat ride but rather incredible.
Mexico Rocks is a very large area and is popular because it is beautiful - don't miss it.
Also Hol Chan is smashing - just try to go on a non-cruise ship day.

Nice snorkeling can be found off the docks of Amigo Del Mar and Hustlers. Its good for a test snorkel to check out equipment, and diving skills.