The cruise ship idea sounds like an incredible experience. Yeah, it's a job and not a vacation but it sounds like a REALLY COOL job. The whole thing sounds really exciting!!! I just had half a year off with no school or work and I kind of regret not doing anything particularly awesome with it (well, there was Brawl, but that wasn't particularly adventurous :P). I hope you can use your time to do something super-nifty like the last two options on your list. ♥