You can Valet on Church street if you are comfortable doing that, $20 on the street itself, you get to watch the guy drive your car turn around and park and you get your keys right back so when you leave there is no waiting for the valet, if a spots available, think its $10 otherwise and the keys stay with the valet. Not fond of parking my NSX in the other garages. Think a cab ride from I-Drive to downtown would be about $40 which isn't bad amongst four people, plus you wouldn't have to worry about your car. Think you could also Valet at the Grand Bohemian and walk the block or two to church street etc. Just a couple ideas, if it were me and I were with a decent size group, I'd cab it.