I noticed it depends. I booked mine on booking and it was $50 for two people. I went to book again and it was $75. So I think it depends on how far ahead of time you book. On booking on the Westin website look for the packages or deals tab and try there
Dear jclemensSacramentoca: by car / taxi it's about 10 minutes (perhaps some minutes more if at the moment of your hotel transfer the area of the dock is very busy due to cruise arrivals and/or departures at the same time).
Best regards from Cozumel, and we hope you will give us the opportunity to welcome you at our property in the coming future. If you have any addtional questions, please do not hesitate to contact us directly at The Westin.