My husband & I are returning to Cozumel on Monday ( woo hoo!!!) and planning to take a day trip to the Labnaha cenotes. I'm curious if most people pre-book online, or if it's safe to just pay at the gate on the day we decide to go? We are thinking of doing just the underground cenotes portion of the trip, however, I didn't see an option for this online. i just want to make sure we don't make the long journey over from Cozumel, only to find they are at capacity. I'm also curious if there are any recommended beaches nearby? Thanks for any and all information!!