Did you get a copy of the ship's tours yet? What cruise line and ship are you sailing upon? We are doing the Carnival Legend exotic Western itinerary. At Belize, the Altun Ha/River wallace tour is getting good reviews. If you must snorkle then the swim with the sting rays and baby sharks sounds exciting. At Limon, the Tortugero Canals are popular and the Aerial Tram tour is the #1 tour, however reviews have been negative due to the lack of wild animal siteings. The rainforest canopy prevents viewing below and of course it rains! Independent tours are offered at the port with rates posted as you get off the ship Colon is the place to plan a ship's tour. Go right into the canal unless you have been through it before.