If you are staying at the Occidental at Xcaret, you can add admission to your room reservation. The night show and dinner is a must-see! There are also a range of other parks to visit that have something to offer for everyone. Check out the website for more options.
Coba boasts the second-tallest Mayan pyramid in the world, called Nohuch Mul, which you can actually climb! It is close enough to Playa Del Carmen to do a shorter tour if you like, or a full-day tour, including exploring nearby cenotes. Check out this website for tour options that include pick-up and drop-off.
There is so much to see and do in Tulum, from Mayan ruins on the beach to Casa Malca (a mansion once owned by Pablo Escobar). This site rounded up a few different tours that offer hotel pickup and drop off. There are also buses that run from Playa Del Carmen to Tulum if you’d like to do some exploring on your own.