Basically I take my holidays on my own... (Must be 15 years since I shared one)
Going to visit relatives only half counts, as alone, and as holiday.
And many of the things I like, especially my computer and my heaps of books are already at home, so I don't automatically feel the pull to "go somewhere" when I have time off from work.
On the other hand I've flown the Atlantic to visit a museum.
(Though the rest of Toronto was interesting, and frozen Niagara impressive)
Travelling as a "one" has advantage and disadvantages. No conflict over what to do, or when, but restaurants etc. can feel odd when everyone else appears to be on pairs or groups.
This September, I may be heading for Wisconsin, again on a whim to visit a particular museum, and see what else I can see.
House on the Rock, Spring Green, anyone?