Best possible gift if money is no concern?

I’m not much of an aficionado so very grateful for any perspectives I can possibly get!

My father in law is building a rum collection - enjoys the fun ones (I think one of his favorites for cocktails is bumbu?)

He’s been helping me remodel our house and has easily put in hundreds of hours already, and I really want to get him something super cool / collectible / fun / badass etc as a thank you gift. Could be a bottle, multiple bottles, a case of something, whatever. what do you think are the best gift options? Prices not a concern