2 suggestions:

1. Despite your enthusiasm, ride day 1 at 10 to 20% less than you feel like. You will be eagar, but save a little- hold yourself back a tad. Days 3 and 4 will be much easier if you back off a little at the start. So if you normally avg 15 mph, ride say 13 to 14. Keep a little in reserve.

2. Pack all your clothes in clear plastic bags. Easier to find what you want, and it just might rain...

See ya there, and let's have fun, OK???

Jack