The Orange County Fair doesn't operate year-round, but the adjacent Centennial Farm fills the gap when the larger agricultural expo isn't around. Four acres and fully functional, Centennial is primarily a venue for school tours, but families can just show up, too, for self-guided tours (the official website doesn't mention this, but you can just stop by on a whim or book a tour, even if you're not affiliated with a school). See the cows get milked! Pet the baby chicks! Check out how crops are grown! Best of all, it's totally free, and your kids might learn something, to boot (they may also demand a new pet afterward?be prepared!). Just don't leave it until too late in the day: Farms operate on an early schedule, and things close up at 4 p.m.