Make sure you check the weather forcast before you go.
In addition to the tools etc. Badger mentioned, if you'll be away from your
overnight bag you'll need to carry some extra clothes, or raingear etc. with you on the bike,
in case of a change in the weather. This can happen easily in the time you'll be riding (6+ hours).
And then there's the next day to think about, where you'll want a
change of riding clothes, of course these you can store in your overnight bag.
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"...perhaps the world needs a little more Canada" - Jean Chretian, 2003.