At a Livestrong ride, there will be lots of people there. Everyone will just find a place to lean their bike, then go get food/water or head for the porta-potties. There might be a line, especially at the first rest stop.

Any time I do a group ride, I don't worry about my bike as long as there are other people from the group at the rest stop. If it's a club ride and we're stopped at a store, I'll take my wallet, phone and keys out of my bike bag and keep them with me until I start to ride again. At charity rides and organized rides like centuries, I don't worry about them.

I'm sure there's a first time for everything, but I've never heard of any theft problems at rest stops at organized rides.

I don't even know where my bike locks are. I think they're the old kind that you can pick with a pen cap...