Well, let's see.....
Pomona isn't that far out. You're right near Raging Waters, so you can take your board-short, beer-gut self to the water park to hit on pre teens. The county golf course, Mountain Meadows, overlooks the fairgrounds and the Speedway and offers great views of the Pomona Valley. There's a botanical garden, Rancho Santa Ana nearby, but that seems too pussy for you. If you like hiking, you're about 15-20 minutes from the hiking trails at Mt Baldy. If you like a hipsterish bar scene, I recommend my favorite hangout about a half hour down the CA-57, old town Fullerton. In particular, there's Hopscotch Tavern overlooking the Fullerton train station that has a full selection of whiskey and beer. I hang out there whenever I can. Disney is another 5-10 minutes down the CA-57 if you like paying a lot to be in a cattle call or you actually are a reeeeeeally die hard Disney fan. Nearby in downtown Anaheim, there's the Anaheim Packing District. Another 15-20 minutes from there (let's say an hour from Pomona) there's Old Town Orange and some great bars (Chapman east of the "Orange Crush" freeway interchange. Hit me up for specifics.