I recently returned from my second trip to RCL. I was there in September, the tarpon average seemed bigger (close to 120 lb average) and we were able to go outside the river mouth to fish for them. I went back in January and was not able to get outside, so we fished the river mouth. The tarpon averaged about 100-110 lbs. I would recommend September-October, or April-May. There is also great snook fishing. Actually, I would recommend anytime, the fishing is great, the staff is outstanding, and you won't be loosing any weight at the table! I'm already planning my next trip.