What you must take with you:

Sturdy shoes for running/hiking.
Long pants for running/hiking (to protect from poison oak and spiky bushes).

Compass (we have a few if you don't have one, or you can rent one from the hosting club).

Water (usually there are 1-2 water controls and also water at the finish, but you don't want to rely on that)

From personal experience - it is great and often quite necessary, to be able to change after orienteering.  Therefore, in addition to my orienteering outfit, I take a spare T-shirt, socks, sandals, and underwear (you never know what happens when you see a mountain lion :)

      What you might take with you (especially if you plan on running competitively):

1 transparent plastic bag, letter size, for the map - just in case ... it almost never rains in SoCal, but if it does, you want to protect your map!

Clear packing tape and duct tape

A pen (red color)

      Following you might want to have:

A light snack
Sun block lotion

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