The ADO network is your backbone
The long-distance ADO and ADO GL coaches are the workhorse of the region. From Cancún's downtown terminal on Avenida Uxmal and the airport's ground-transport area, they run south to Playa del Carmen's terminal on Avenida 20 and on to Tulum's stop near the centre, roughly every 20 to 30 minutes during the day. Playa to Tulum takes about an hour; Cancún airport to Playa runs 50 to 70 minutes depending on traffic. Fares sit in the low hundreds of pesos, and booking the day before at the counter or online secures a seat on busy weekends.
Playa del Carmen suits travellers who want the best-connected base: the ADO terminal puts you within walking distance of Fifth Avenue and the ferry dock, so day trips to Cozumel or Tulum need no car at all. Tulum's bus stop is less central, a short taxi ride from the beach zone, which matters if you book a hotel down the coastal road. For a first trip, I would book in Playa for the transport alone, then move to Tulum for two or three nights rather than commuting daily.
Colectivos and local buses for short hops
White colectivo vans shuttle along the coastal highway between Playa del Carmen and Tulum, picking up on Avenida 20 near Calle 2 and dropping at the Tulum ruins junction. They leave when full, cost a fraction of a taxi, and take around 45 minutes. Local buses in Playa run along Fifth Avenue and to the Playacar gate; in Cancún, the R1 and R2 city buses connect downtown to the Hotel Zone for pocket change. These are practical, unglamorous and used by residents every day.
Two things to skip: the collective vans do not serve Cancún airport, so plan an ADO coach or a pre-arranged transfer for arrival day. And avoid hiring a car for the Playa–Tulum corridor alone; parking near the beach clubs is scarce and expensive in high season. If your hotel is inland in Tulum pueblo, though, having a car makes more sense, because taxis after dark are limited and rates climb.
Islands, ruins and cenotes by ferry and tour
Cozumel is reached by passenger ferry from Playa del Carmen's dock at the foot of Calle Benito Juárez; the crossing takes 30 to 45 minutes and runs from early morning to late evening. On the island, rental scooters, taxis and the ferry-terminal bus cover the San Miguel waterfront and the beach clubs to the south. For Chichén Itzá, the practical option is a first-class ADO coach from Playa or Cancún, about three hours each way, or an organised day tour that includes a cenote stop.
Cenotes near Tulum such as Gran Cenote and Dos Ojos are easiest by colectivo plus a short walk, or by taxi if you are a group. Bikes are popular in Tulum and Playa for short flat rides, but use them in daylight and check brakes before paying. The best months for this kind of moving around are November to April, when heat and afternoon storms are milder; July and August are hot and crowded, and September brings the heaviest rain.
Where to base yourself and what to book
For a car-free itinerary, split the trip: three or four nights in Playa del Carmen for ferries, ruins and easy bus links, then two or three in Tulum for the beach and cenotes. Puerto Morelos, between Cancún and Playa, is a quieter alternative with its own colectivo stop and a compact centre. Cancún's Hotel Zone is convenient for airport arrivals but spreads along a single avenue, so choose a hotel near a bus stop if you plan to head downtown often.
When booking, check the walking distance to the ADO terminal or the nearest colectivo pickup before you commit. A hotel two blocks from Avenida 20 in Playa saves taxi fares every day. In Tulum, confirm whether your hotel sits on the beach road or in the pueblo; the difference is a 15-minute ride. Search our listings by neighbourhood and read the location notes, then book the base that matches the transport you will actually use.