Is it safe to drink the tap water?

No. Only drink bottled or filtered water, and avoid drinks with ice unless you are at a reputable restaurant.

Do I need a car in Tulum?

A car is actually a burden due to limited parking and heavy traffic. Bicycles are the best way to get around.

How to spend 3 days in Tulum

Spend your first day exploring the ruins and local beaches, reserve your second day for cenote hopping in the jungle, and dedicate your final day to the Sian Ka’an Biosphere. Rent a bicycle to navigate the beach road efficiently and avoid the heavy taxi traffic.

Rent a bicycle for your stay. Do not rely on taxis, which are overpriced and unreliable. Rent a sturdy beach cruiser for $10-15 USD per day from any local rental shop in Tulum Town or the Hotel Zone.
Get to the ruins early. Arrive at the Tulum Archaeological Site by 8:00 AM. Being at the gate when it opens allows you to see the ruins before the tour buses from Cancun arrive at 10:30 AM.
Use Colectivos for transit. If you are traveling outside of the immediate hotel zone, use the white 'colectivo' vans that run along Highway 307. They cost about $2-3 USD per ride and are the standard way locals get around.

Is it safe to drink the tap water?: No. Only drink bottled or filtered water, and avoid drinks with ice unless you are at a reputable restaurant.
Do I need a car in Tulum?: A car is actually a burden due to limited parking and heavy traffic. Bicycles are the best way to get around.