Am interested in visiting the Dry Tortugas and kayaking - would like info on logistics from anyone who has done this. We will be travelling sometime in winter, based in Florida City, but planning a couple days in the lower keys. Have been to the keys many times but never the Tortugas (always balked at the expense, but have decided to go for it, just once.). We have some experience sea kayaking but are far from expert; a group tour, if it exists, would be ideal. We plan a day trip, not camping. Many thanks!