I am going on the Carnival Paradise western Caribbean cruise this coming Sunday. I'd like to go for the Tulum tour in Cozumel. Some of you posted to have got there by "taking a cab and go with the tour at the site". Can anyone tell me how long it takes to get there by cab and how much it costs if I go on my own? Is it worth doing it independently? Carnival says it is a 7-hour tour. I would imagine it would be quite expensive. Thanks.