It's nice to hear what others do about valet tipping. I always wonder about tipping when I drop off, since it's often not the same CM who brings it back, so I tip both ways, but often just $1.00 when leaving it and $2 when we pick it up.
If you're changing resorts during your stay you might also want to double check the room charge. Typically we haven't been charged valet fees on the day we check out but we were charged once at both the Poly and BC during a split stay.
It wouldn't have been an issue if I'd caught it right then but I live in denial and refuse to open that express check-out envelope before the credit card statement arrives.
I pout enough just having to come home...I don't even want to think about what it cost me - at least for a month or so anyway. Thankfully, those express envelopes aren't easy to see thru so I've never even been tempted...