Wineries are possible. Galleano closes at 6:00. Fillippi closes tasting room at 6:30 on Saturday. http://www.galleanowinery.com/winery-info/tasting/
http://www.josephfilippiwinery.com/

Cirque du Soleil-Quidam 7:30 on 4/30
http://www.cbbankarena.com/default.asp?cbba=127

I think Ontario Mills is your best bet. It's the largest single story mall in the West so you'll get your walking in. There's an AMC multiplex & 200 stores, one of the last Kenny Rogers Roasters in America and a lot of other restaurants big and small. The huge JC Penny Outlet is closing this year but is going to be open through April and May. The mortgage meltdown hit the Inland Empire hard.

I recommend a car if you're going to a place without an airport shuttle.