As of December 2012, price on Ultramar is 312 pesos round trip (currently $25US)
Ferries run from Playa del Carmen to Cozumel every hour on the hour. The UltraMar ferries currently run from 5 am-10 pm from Cozumel (no service at 6am, 1pm, 7 pm or 9pm) and 6 am-11 pm from PDC (no service at 7am, 2pm, 8pm, or 10pm). The schedule is subject to change so it's best to check in advance if you are not close to the ferry terminal.
There are two different ferry companies, UltraMar and Mexicana, both of which took about the same amount of time (I think it was about 30-35 minutes), left at the same time and cost the same. There were many booths around the 5th Avenue area that you could purchase tickets and there seemed to be plenty of room, we bought our tickets about 5 minutes before the ferry was supposed to leave.
Ferries can be picked up at the very south end of 5th Avenue at the ferry terminal.
There is a new ferry terminal at Avenida Constituyentes that had an UltraMar booth that said Cozumel on it. We saw a ferry pull up so it looks like it is functional
Ferries takes you out to the island of Cozumel. The ride takes about half an hour, and costs 10-15 USD for a roundtrip. The ferries goes almost every hour, but they will usually give you a timetable when you buy the ticket. Ticketbooths are all over the city, and they always have a sign telling you when the next boat leaves. The ferry dock is located south at 5ta Avenida. The sea can be quite rough so if you have problems with seasickness it can be a good idea to take a pill before you go.
Ferries take people to the island of Cozumel. The ride takes about half an hour, and costs 10-15 USD for a roundtrip. The ferries go every hour on the hour from 6am - 11pm. The ferry dock is located on Calle 1 Sur, east of 5th Avenue.
The Ferry from Playa del Carmen to Cozumel takes about 30 minutes. There are refreshments on board.
The seas were rough during the Ferry ride to Playa del Carmen. We sat near the bathrooms and there were a lot of sick people waiting in line. However, the rough seas were nothing compared with what we faced later that night.
The Ferry ride to Cozumel was death defying. True to our natures we were cracking jokes the whole way. In reality, we feared for our lives. The 30 minute trip lasted about 2 hours. The tiny ship was tossed. I really thought we were going down. Luckily, comic relief in the form of a woman selling jewelry and blankets took our minds off inevitable doom. We imagined scenarios of her persitant selling as we sank into the deep dark depths which were waiting to engulf us. It took my mind off death until Cory pointed out the pitch-black, ominous cloud that seemed to be getting closer and closer to the water every minute. It was a forming tornado or a waterspout.
You can see in the pictures how quickly it got dark. I was too terrified to take any pictures of the cloud but now I wish I had. It was amazing.
This ferry runs once an hour from Playa del Carmen to Cozumel. Cost $8.50US one way.
Buy tickets at the pier where the ferry docks.