Not something that I condone!
Are there any transport options if you wanted to have a celebration dinner for two at the Ahwahnee, enjoy a bottle of good wine, perhaps some pre-dinner cocktails and then get back 'home' to your rental property in the park?
It looks as if the only way you can have a drink is if you're staying in the hotel, or are prepared to drink drive. Is this the case? Are there any car services that will take a booking?