I'm curious as to the current state of Hotel Cozumel, especially since as Kimela said it's been purchased by Wyndham. When I've read about it in the past, these points were made:
1.) The A.I. food was variously described as 'good enough and good value for money' to 'inedible,' depending on who I listened to. Some considered it cheap enough that if they ate dinner elsewhere a few times, no great loss. For an A.I., I'd probably hit Trip Advisor and see what people are saying lately.
2.) Okay, this one is going off memory, and few years back. Regarding packages with Dive Paradise, they were said to have some big, fairly slow boats, but also some smaller, faster ones. But someone way back indicated if you booked one of the cheap package deals, it was hard (or impossible) to upgrade it after the fact to the smaller, faster boats?
3.) IIRC, recent posts have cast doubt on the really good overall value package it represents, but I haven't seen the latest prices.
I don't have the current answers to these questions, but these are the questions I'd ask if considering a stay there. I'd probably communicate with Dive Paradise directly before booking any package deals, and see if you may want to book with them independently and what, if anything, is to be gained.