Great! Thanks again for so much info- So much to think about and take in
@nwflyboy Will check out Hotel Cozumel- and also the diving company. It's great to know that the boutique operaters keep groups small

And also that you can be picked up where you are staying- I think we will feel spoiled

Also reassuring to get your opinion, info on the cruise ship flow. You are right- after diving we are just going to want to chill for a while

As for Tulum.. will think about it.. don't think we will want to spend the $$$ to stay on the beach.. that is what we would go for- maybe though we will stay a few nights in Tulum town and visit the beach.. will see.. and will go to the south end..
It's funny cause in Hawaii we don't stay by beaches at all- just lava rock- lots of reefs and we love it.. snorkel every day (we go to the beaches once or twice over 2 weeks- about a 90 minute drive from where we stay).. so I don't know why I want to go to the beach in Mexico so much (maybe its just because its the Carribean Sea?).
Thanks also for the ruin tips.. will take a look and see what fits and flows- some driving is ok- too much- Nope - So probably Northern Route- or maybe Coba and Northern Route

And excited to swim in the cenotes.. and eat wonderful food.
We are flying into Cancun for sure (haven't booked our flights yet- but can get a non stop there at a good price). It will be easy enough to get to Cozumel. Thank you so much - And enjoy your time in Mexico! I can't wait!
@nodakdive
I did hear of Paamul- it looks like they are all booked for April.. But will keep looking- something may open up. Room prices have gone up a bit too- which I don't mind paying a bit more- but Tulum beaches prices are insane
@Trailboss123 THanks for the hotel info will check it out
You all have been so helpful. Thank you so much for your time!!