Coba and Tulum are two fantastic Mayan ruins nearby to Playa del Carmen – below are some photos from both.
Tulum gets a lot of tourists because it’s so close to Playa and Cancun (and has a beautiful beach) – whereas Coba is a bit further away, and a bit quieter (if you arrive before or after the tour groups do). Coba is also a much larger site – there’s about 6km of walking needed to access all the ruins. If you’re not up to walking, you can hire a bicycle (35MXD) or get someone else to drive you around in a cyclo/bicycle-taxi (140MXD normally but 70MXD in the low season).
These sites are both worth checking out!