Matt's advice sounds right on, being first-hand. On second thought I'm dropping C.R. off my personal list on favor of the Cabo area. I understand it's a more limited seasonal shot at roosters around that zone but with Jim Shaunessy (of Beulah Flyrods) having camp right there and dialed into it that's the way I'm going to go for the rooster hunt IMHO.
As far as tarpon, they are all over the carribean in seemingly every lagoon or fishing fleet dock so I wouldn't go to C.R. for just the tarpon.
It's the home of some of my favorite coffee though, second only to pure Kona