Take highway 307 from Cancun Airport to Tulum, which passes through Playa del Carmen. In all, the trip is about 1.5 – 2 hours drive.
When you enter Tulum, you’ll come to a four-way set of traffic lights with a 7-11 on your left. Turn left at these lights and head towards the beach (the sign overhead says ‘Boca Paila’). You’ll then come to a fork in the road, turn right, pass through a small checkpoint and keep going until you see the sign for Yoga Shala on your right. Turn left after Yoga Shala and you’ll enter Ahau Tulum.