I'm from Holland and fly out of KBIV (Tulip City), where I assume you will be landing. Like 2000 said, the New Holland Brewery is a good place for food. Other good places are Perredies, The Piper, or 84 East for Italian, or Crazy Horse Steakhouse for traditional American. Never played at the Ravines, which is about 8 miles south of the airport, but have heard great things about it.
As far as touristy things, the Tulip Festival in May is the peak of the celebration of the Dutch heritage here, but everyone around here is always celebrating being Dutch. There is a place called Dutch Village, which is some type of amusement park (not really sure what is there, actually. I've lived here my whole life and haven't been there once). You could also check out Windmill Island. There are many little Dutch shops there.
Personally, I would recommend packing a bathing suit and towel and going to Holland State Park on the north side and lounging on Ottawa Beach. That is by far the favorite destination for the area in the summer. There is also some nice beach/hiking at Saugatuck Dunes State Park about 5-6 miles south of the airport. Really is fun messing around in this area by Lake Michigan during the summer. Just let me know if you want any more info. Hopefully you enjoy it here, even though the airport "terminal" is a joke. It is an old house and is pretty small and sometimes smelly. But, Tulip City Air is a great place and I think you will like the new runway extention/road tunnel at the airport. It really is one of the better non-towered airport around.