If you are only planning on doing it for the summer I would advise you to get another job. You wont make much money since thats when every wants to "try out messengering." If you do come here and make it to/work through the winter then you will probably know the city, some other messengers, and be with a better company than you started with making some decent money. Also, keep the "overeducated" talk to a minimum.
ps - we have velodromes ski resorts and everything here or within a couple of hours. As long as you dont want to do something like swim in the ocean you can find it here.