Do resverations for the ferry from the mainland to the Cayes have to be made in advance? What about flights on Tropic Air?

If I wanted to spend 3 nights on the one of the Cayes for the beach & swim experence, then two nights inland to see the zoo and at least one of the Mayan Ruins, can anyone suggest a hotel on the main land that would be safe and clean for a family - no frills is fine, but safe and clean are a must.