I say go out! You only have one birthday a year
In terms of drinks, you could have a vodka soda or rum and diet coke, basically anything with diet soda will have less calories than a margarita or something like that.
Just make sure you're still accountable for the calories you drink. You could also consider drinking less than you normal might, or trying to eat healthy that day and then have drinks.
Good luck, and Happy Birthday!