I parked at the Park & Ride at Liberty this evening. Pros: excellent view from where I was (fourth floor), clean, guards everywhere. Cons: driving to the exit sucks. Also, Block A on every floor is right next to the ramp; if a car is backing out of a parking spot there and you're driving up the ramp, you'll have to stop partway to let it pass. Also also, the drive to the exit uses the same ramp, and the signs are all wrong ("Keep Right" when it should say "Keep Left").
Still, the view is great. Maybe I'll bring a camera next time.