Title says it all. My girlfriend(21) and I(22m) wanted to do something really cool for our 5 year anniversary, and we're finally in a position where we can start traveling. We're from San Antonio, and my girlfriend suggested Michigan cause it's pretty much the exact opposite haha. I'm just wondering what things we HAVE to do when we're there. We have 4 days in Detroit, and I'm just not too good at cool trip ideas since I've never really been anywhere yet, but I wanna give my girlfriend the best time ever. Thanks :)

Edit: Thank you everyone who gave amazing suggestions, my girlfriend was so happy looking through this thread. Also, the rest of you who couldn't help but comment about how "Detroit Bad" and asking what my deal is, doesnt change the fact that im still coming next month. Murder me yourself when i get there if you want me to be so scared about the crime rate.