Two guys set out on June 15th from Ship Creek in Anchorage Alaska planning on going to Miami Florida. They plan on riding jetski's the entire way with no support boats carrying everything they need with them. The duo admits they have very little knowledge of the coast of America. Their journey can be followed at www.13000miles.com
Sounds like they are biting off more than they can chew. Planning out the trip and figuring out what to expect along the coast sounds like something I'd do before I took off. Best of luck to them.