I don’t know about cheap hotels during the high season. I did do some scuba and I recommend going to Manta Dive shop right next to the Office Restaurant. They have really nice guys that take you out and give you a really good tour. I recommend going on the corridor dive there are less people going on that trip and if you are lucky you will get to go alone with your guide.

We went in May so the visibility was OK. But it will be prime time in October have fun.