Avoid the following tour operators..they are terrible:

Take 'em Deeper Dive Shop and Tequila Bar

One Armed Stumpy's Crocodile Feeding Tours

Get Lost Jungle Expeditions (Motto: We Will Miss You!)

Ernest's "Wanna go fishing tomorrow, then pay me half now" charter service. We guarantee our great safety record. We never show up.

....you won't find anything good about these operators on the message boards.

The last one actually existed for years on the island!