The All American Raceway was just recently upgraded to NASCar standards and is located on the fairgrounds. They have racing there almost every weekend.

The big Westfield's Galleria Shopping Mall is only about 3 miles from the Fairgrounds.
http://westfield.com/galleriaatroseville/index.html

There are a bunch of newer hotels at the corner of Roseville Parkway and Taylor Rd - you can check it on google.

Lots of good restaurants and other shopping in the area as well - PF Chang's, Mimi's, Ruth Crist Steakhouse and about every other chain type place. Thunder Valley has two upscale places as well.