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My only piece of advice, though it's not kid-specific, is that Tulum is a 45 minute ferry ride and then a 45 minute car/bus ride from Cozumel. Tulum is gorgeous, but it is a bit of a hike from Cozumel.

ETA: if you do go to Tulum, Sunday is a good day to go, because there are no cruise ships in port on Sundays. Tulum is packed with cruise ship visitors most days from about noon on.
ETA again... sorry, can you tell I Cozumel?? If you're looking for another fun thing to do, rent a car and drive to the east side of the island. It's only a 20 minute drive and there's nothing out there (no electricity) except a few rustic bar/restaurants and beautiful vacant beaches. There's also a national park on the southern tip of the island, with a lighthouse, snorkeling, a beach, crocodiles, etc.

I've never been, but most hotels have high chairs and baby beds, call them to reserve at least the baby bed!

We went to Cancun when our LO was 9 months. We took 2 crib sheets for the crib the hotel provided, a noise machine (ipod plugged into wall), and a fold up travel float for the pool. We also took lots of food pouches to supplement what we felt was okay for him to eat. I also bought throw away paper bibs to avoid laundry. Our hotel had plenty of high chairs on hand at all the restaurants.

I bought a baby sunblock stick that was awesome and easy to put on ears and face. He lived in his rashguard and a diaper while outside, and then onesies inside. Have fun!

Not sure if there are mosquitos or not, but bring baby safe bug spray and itch cream. We were being bit like crazy and thankfully a friend had something baby safe, otherwise we were debating getting some bug spray from the gift shop and we had no idea what the ingredients were.

We went to Playa del Carmen with our DD when she was a little over a year old. The staff loved her, I don't think they got a lot of little kids there.
The only thing we weren't aware of was that our room was completely tiled. Our DD fell in our room and it was kind of scary. She was fine, but I would check with your insurance about what happens if your are out of the country and an accident happens. Hopefully everything will be fine, but it is always better to be prepared.
We got a crib from the hotel, but it had slats broken out of it so it wasn't the safest thing. If you use the hotels stuff, be prepared for it to not always be completely up to what you're used to.

See what the hotels have--ours had baby food, cribs, sand toys, baby toys, bottle warmers, monitors, and strollers we could borrow. So we didn't have to bring anything.

I would bring some water shoes....E *hated* the feel of sand on her feet and it was really difficult to give her a shower because we had no bath in our room, and she freaked out and I worried about her slipping. We had brought crocs, but I really wish I had some better shoes for her. The tile just isn't the best for little kids, but it's all over the place there.

Bring lots of bug spray, sunblock....E's favorite things were to throw a ball in the pool. Over and over. Some of those $1 rafts were good, too. A couple of swimsuits are good, too--ours never totally dried out from the night before, so it was nice to have a few pairs. Plus it's not like she wore it all day. She'd be in it for a few hours, out for lunch and stuff and her nap, back in it, then back out for her nap, then back in it...baby powder to get the sand off her. She also liked the cheapo beach balls. Those were a blast for her.