Also, I believe you only have to pay for valet parking once in a day (that it's transferable to other resorts).
So if you Valet park at BW in the morning and pay your $6, you should be able to Valet part at WL in the afternoon for free, by showing your ticket/receipt from the AM parking.
This is ONLY the Valet fee - of course, you should always tip at all locations.