I try to show up at a race venue 1.5 to 2 hrs prior to my race. First stop is always the porta potty! Then registration, back to the car to kit up, and out on the course to pre-ride at least a lap (assuming that is allowed) - this won't work in your case if it is a point-to-point, but perhaps riding the start one or two times to pick a really good line would be helpful. Even riding as much as 3 miles in and then back would give a leg up on that first piece of the race.

Then, back to the car for food and drink prior to the race. Another trip to the porta potty and any last minute MINOR adjustments to the bike.

Last part? Lining up and telling the da*ned butterflies to take a chill pill!

You'll be fine! And I, personally, would skip the iPod - no need to carry it (and potentially lose it) during the race.

SheFly