Seashell, I agree with your idea of the flyers/signage at the hotels. It will deter the tourists with the thought of a possible fine, but I doubt the danger level will sink in.
Check out what Vince & Cherie are doing to help the crocs at the ACES preserve. http://www.americancrocodilesanctuary.org/
We had the opportunity to go and visit them our last trip, the setup they have to view & learn about the crocs is impressive. They have 2 lovely guest houses if you're interested in staying for a few days. "GEORGE" and "DEBBIE" are two of the resident crocs, both were relocated from San Pedro when they became too familiar with humans. I imagine they will be called upon soon to come and capture/rescue the family of crocs in the lagoon.