I gave these recommendations a few weeks ago, thought I'd copy and paste for this thread:
There's plenty to do, depending on your tastes.
The
East 4th district has many great restaurants and hang-outs, my favorite being Iron Chef Michael Symon's
Lola Bistro restaurant.
Less than a five minute walk from East 4th is the newly-opened
Horseshoe Casino, which has slots and some table games. Haven't been there yet, as I'm not much for gaming, but the buzz is positive.
The
Greater Cleveland Aquarium is on the west bank of the Flats, in the Powerhouse building. It just opened earlier this year, and while not a full-day attraction, I bet you can have fun for an hour or two. Also on the west bank of the flats is one of my favorite concert venues, the
Jacobs Pavilion.
You can see an
Indians game at Progressive Field, one of the nicer ballparks around (then again, I'm biased). There's also the
University Circle area, which houses the Cleveland Museum of Art, the Natural Science Museum and a few other places worth visiting.
Mentioned above, the
West Side Market is a nice foodie place, and has just kicked off their centennial celebration this summer. Plus, the market happens to be in one of the more upcoming areas of town (the West 25th area), especially if you like BEER.
Great Lakes Brewery,
Market Garden Brewery,
Bier Markt, and lots of other places are within minutes (some even seconds) of the market. Explore more about the
West 25th area on Yelp.
And this is just off the top of my head. If you're willing to do more exploration, I can probably suggest other stuff too.
Addition:
The Great Lakes Science Center is right next door to the Rock Hall. Some great exhibits, and an Omnimax movie theater as well.