The ADO transfer in Cancun would be much easier than switching buses in Playa because the bus leaves from the same terminal. In playa the airport buses go to Fifth Ave but the buses to Tulum usually leave from the terminal on twentieth street. The transfer could involve a taxi ride.

The vans queued up outside the airport drop people at their respective resorts. Intima Resort (Mak Nuk) would certainly be one of the last.

Taxi would be the absolutely the most expensive option.

Playa Info runs a private shuttle van. They are always on time and very reliable. That is about 60us to Playa so Tulum would be a little more. You and your group would be the only passengers and go directly to your destination. The driver will make one stop for refreshments if requested.