My constraint isn't just money, it's also time. Here are my ideas: https://github.com/jjasonbell/Ideas/blob/master/Ideas.pdf

I think if you forced me to choose now, I'd probably do the third one: "Sabbaticals for non-Academics". I haven't gone through this list for a while though.

Since I am the audience for the list, it's probably weird to read, but I think you can see the gist for any of them. Hopefully there is nothing too personal/embarrassing.