Looking for a pleasant spot in Mexico, free of beach vendors, sleepy and reminiscent of the mexico of the Sixties?
I recommend to you Zamas, just south of Tulum, on the east coast of Mexico.
I meant to post something about just after we returned in February, but time got away from me. A recent mailing from the hotel jogged my memory–so here is my experience:
We rented a car in Cancun and drove a couple of hours south. A shuttle would do as well and save some money. Taxis abound in Tulum and will take you where you want. 
The ruins there are astounding, but if you want to really be impressed, seek out Chichenitza, 
about 2 1/2 hours away. It is worth it to read up on Mayan culture and the history of the area before. Then hire an English speaking guide when you get there to fill out the details.
Another diviersion isn the area are the local cenotes: freshwater, crystal clear pools that dot the countryside. 
The clarity of the water is incredible, the swimming fabulous and the underwater rock formations, awesome.
Back at the hotel Zamas, 
you can arrange an in room massage (the rooms are clean and nicely turned out with great bathrooms. No air conditioning, but good fans and mosquito netting)), a snorkel trip, a fishing expedition, or scuba diving. The restaurant has very good food: Mexican/French and very fresh fish. 
In fact, the evenings catch arrived on the beach one afternoon, courtesy of a couple of local young men.
The bar has great drinks and there is live music: a different band nearly every night. 
Dance in the sand at the water’s edge, under the stars. It’s heaven.
Next chance I have we’ll return. I just hope it is still as unspoiled as I remember. Don’t tell anyone.