Normally you could salmon fish. They run from the lake inland this time of year. The rivers are so low this year though, it's not going to happen. Per the Orvis stores in both GR and EL.
My experience in East Lansing is go somewhere else.
If you like USDA Prime, Capital Prime is very good, with prices to match. Nothing out of the ordinary, you aren't going to get Kobe or Wagyu there, but their prime is actually prime, and it's very good.
I know nothing about the party scene. We usually golf or fish the Friday before game day, try to find a high end steak place, and relax. Which is essentially what we'll do this year.
It's been awhile since we've played there, but I'm almost certain parking is a challenge.
It's probably too early, but you might catch some decent fall colors on the way there depending on the route you take, and if it's that time of year yet, which I don't think it is.