480mi on a Street Bob,
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Lots of good advice already provided. \\; I just returned from a long one with the Mrs. \\; It is friggin hot out there (I was a bit farther south) but 90 deg, is 90 deg. \\; My 2 cents is to echo the following suggestions:
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Sunscreen
Water
10 Min breaks every hour/70 miles
and +1 for the music \\; (That Ipod shuffle is the shizzle, clips right on to a belt, not bulky at all, and out of the way. \\; best deal out there)
 \\;
Enjoy
The riders backrest is the secret to long days in the saddle, and comfortable rest once off. \\; The other stuff too, but a backrest is the best thing you can do for yourself.
I would also suggest long sleeves and gloves. \\; Not for sun protection but for wind. \\; It's amazing how much wind burn one can get in a long day's ride.