Have been on trip before with a tour company. Would like to do trip without tour. No need to spend time on mainland. Is it possible to schedule and just catch 7 day tour boat from Santa Cruz?
Yes, this is extremely common. Technically, I believe most cruises leave out of Baltra (where the airport is). (Baltra and Santa Cruz are about 150 meters apart and there is a quick little ferry that goes back and forth.) Anyway, a multitude of tourists just fly into Baltra/Santa Cruz, take their cruise from there, and return the same way.