first I would go nutz for maybe two weeks, travel, party, bring friends and family....enjoy it.
Then I'd get a good financial advisor and invest pretty much all the rest, so when i get a family I'll be set. Then I'd finish my last year of school, continue to med school...and basically live an enjoyable life happy that i have that wonderful cushion.
ohh...and I would fuckin TIP BIG! and give great gifts on birthdays. Most of the fun of having money (for me) is sharing it.