My wife and I visited Chankanaab park during our stay on Cozumel March 10-18 2012.
You could easily spend the better part of the day here or even the whole day here. Definately geared towards families here, and it was very clean.
We were staying on Cozumel, and we got there fairly early before there were any crowds there, although the day we visited it never felt very crowded. There was one point where a large crowd came in, but they seemed to disperse pretty quickly.
We took a taxi from our hotel to get there, and didn't have any problem getting taxi when we left later on. They were very well organized there, there was someone out front that handled getting folks taxis on the way out.
There is an entry fee to the park, and there are other activities in the park that are additional (dolphin encounters, manatee encounters, snuba, etc...). I called the order line the morning we decided to go to the park and scheduled my wife's dolphin swim for the same day, so it is possible to do that late notice but you may want to book further ahead than that (we may just have gotten lucky).
My wife did the dolphin swim and she really enjoyed it. I took some pictures and video from the side. There was a $5 fee for letting me go along side to take pictures. They take photos and sell them afterwards as well. If you think you don't want to buy their photos you probably will want to pay for the observer fee (it depends on where the encounter is done, the one that they did my wife's encounter in was on the side and I would not have been able to get any shots of it if I didn't pay the observer fee).
They rent snorkeling gear there, but we brought our own snorkeling gear there. We did a bunch of snorkeling while we where there. They have a nice setup for snorkeling, there is a good amount of rocky shoreline there with a wall, and they have steps/platforms for entering/leaving the water at intervals. We went into the water at one end of the park and drifted along towards the end of the park and got out there. The water is not really shallow there, I'm guessing about 10-20 feet. There was plenty of fish around there and the snorkeling was good. There was a small section that was protected/shallow (walk in) and had a beach, which would be good for folks with younger kids.
They have lockers there, food/snack bars, a gift shop.
They also had a seal show that was included, you can get a picture with the seal.
There were some walking paths and a nice lagoon there. You can't swim in the lagoon, but there were some colorful fish in it. I walked around and got some bird & iguana pictures while my wife got some sun on the beach area.
If you are into birding, I did see some hummingbirds there walking on the trails and some frigate birds along the shoreline.
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