I found a company that can take you from the airport in LBJ to Rinca island on a speedboat in a half hour vs a 2 hour each way trip giving you more than enough time plus a snorkeling stop. Only issue is I am going myself and trying to cut the costs. Without the speedboat option you only have a bit over an hour on the island cannot imagine that is worth it. I am trying to see if I can put together a group for July 24th, not sure how to go about doing that though.