January thru March is obviously peak season in the Keys - they have the most reliable warm weather in Florida during that period. It gets full, but that is not really crowded - not a lot of trouble getting around and not too bad at restaurants and other attractions - but the RV spots are all taken. The only reasonably priced sites are the State Parks - which are terrific - but reservations book solid 11 months in advance - it is like winning the lottery to get a spot. There are cancellations from time to time, but they are difficult to catch. There are tons of private campgrounds - from top shelf to tired old trailer parks, but those sites are hard to get too, and certainly not cheap. We think it is worth it, as we love boating, beaching, and fishing, and the desert has no appeal to us, but it takes planning and check book if you want to stay 6-8 weeks like we do. Definitely try it once - it is a unique place ...