Tulum
Tulum is surrounded by cenotes, beaches, and tons of things to do. Though the beach is mostly made up of resorts there are some budget options too. Staying in town is cost effective but the strange setup of Tulum means the town centre is about 3km from the beach. There are also the ruins which look incredible with the backdrop of the sea though it can get busy and the entrance is more of a themepark than a centre of cultural importance. We stayed 4 nights here and barely scratched the surface.