I would probably divide it between travel and art. I've always wanted to do a tour of the southwest and west coast. Go to New Mexico to see Area 51, Hit up Nevada and Vegas. Then work my way through LA, San Diego and San Fran. Might finish up in Seattle or just head home.
Then the rest of the time I would spend finishing all the ideas I have for various mods and games to put in my portfolio.
"Astronomy offers an aesthetic indulgence not duplicated in any other field. This is not an academic or hypothetical attraction and should require no apologies, for the beauty to be found in the skies has been universally appreciated for unrecorded centuries."