A holiday in Vegas?
Joe was right: why not simply ask him? Most people would rather not have “a surprise” for their birthday, especially not one chosen by a person who hardly knows them.
But this is Ambridge, home of the surprise holiday / party / pampering session / pregnancy / stabbycustard / whatever nonsense the SWs think they can get away with.
Actually, I doubt they give a toss about whether they can get away with; that would imply giving some consideration to the listeners’ intelligence
What’s wrong with a tea party ? It normally suffices.
Failing that, bring the floozy from the hunt round & give him some minimum standards to achieve.