I often go on an adults-only trip to DLR. It's my favorite way to unwind and...believe it or not...get away from the kids, LOL!! The thing is, I spend the vast majority of my time taking care of others. At DLR, I get to be the kid.
Anyway, some of my favorite things are:
Wine & cheese tasting at the wine bar in DCA. They used to have chocolate and port tasting but they stopped. Boo hoo!!! It was 3 types of port paired with Ghirardelli chocolates. Anyway, you sign up and pay a fee and you get these pairings and explanations about the chosen wines and cheeses. We got a lot of extra samplings, too! It's a lot of fun! Our sommelier (is that the right word? Wine expert?) was lots of fun and told us to be sure and ride Tower of Terror right afterward and he was right--it was a whole different experience
Napa Rose chef's counter. Amazing. We went fairly late, did the thing where they served wine with every course, and were the last ones out. We went and sat by the fire in the lobby and were joined by a very fun couple who were in their 70s. They'd been married forever and he was some famous person in the computer world. They bought a bottle of wine and we sat there having the best time, although we were kicked out at midnight because we were laughing too much so we went to the mirror image fireplace outside.
Do something fun and silly! Four of us (all women) bought tiaras and wore them our entire trip. It was great fun! We had booked the Fairytale Suite so we decided we were princesses and wanted to look the part.
Go have dessert at Napa Rose late at night. We sat by the fireplace and had so much fun--we each bought something different. Their desserts are amazing.
You could try the spa at GCH. I've never done it but I've wanted to have a facial. I plan to try it sometime.
Buy yourself something, like a personalized glass mug from the Crystal Shop, or have a silhouette or sketch of yourself done. Get that shirt or whatever that you really love but wouldn't buy with all the kids along.
There are tons of other things, but that's a start!