Probably buy a house. I have a condo now, and while it suits me fine, I'll probably wish I'd bought a house and had a dog and maybe a hobby car. I've spent the last ten years trying to not regret I hadn't done more. For eight or nine of those, I followed a band around the world. The generic term people would use is "groupie," but that calls to mind things like doing cocaine with the band, and it's nothing like that. Instead it's a lot of meeting other fans and sleeping on their couches and splitting hotels and seeing small pieces of many cities. Now I'm doing more hiking. I'm working on the Adirondack 46ers, the forty six high peaks in Adirondack Park in upstate New York. I have eight so far, starting last year. If I don't finish the remaining ones, that will be a regret in twenty years.