What do you like to do? Personally, I live to travel and go cycling. I’d be thrilled if a group of folks got me a trip along the Danube or Rhine or a tour around the Scandinavian countries. Japan or western US would be cool too. Even better if a few would join me.
Or a ski trip, or even a heli flight over a few volcanoes, with a week of vacation built around that.
I’m a few years behind you, but I tend do agree with your compatriots. I hit 40 during the Covid years and it was a bit of a bummer not to throw some kind of something, hoping 50 brings something a bit more memorable in a positive way.
Skunk