1st choice - The Napa Lounge at the Napa Rose in the GCH. They have a really lovely patio that most folks don't know about that is actually in/looks into DCA - you can't really see it too much from the walkway at the Grizzly River Rapids, but that is the part of the park that it looks out at. It is trimmed with actual grape vines, there is soothing music coming from that sector of the park, and there are firepits that they light at night and you can sit and enjoy a nice glass of excellent wine. Very romantic and you can also get any food off the Napa Menu. The cappucino's have rock candy stir sticks, too.
When you enter the restaurant, the lounge is the seating to the right. The patio is out the back doors to the far right of the bar. Of course the main lounge seating is very cozy.
We like the Hearthstone, too, but it's brighter and more casual.
Uva bar is defintely more bustling, but still nice.
Depends on the vibe you want.
Nancy