Kids-elementary age and up, there are several safe areas where kids can burn off some steam
If you find yourself in the Inland Empire and are looking to kill an afternoon a walk around Downtown Riverside is worth the time, in my opinion. The beautiful historic buildings in the area center around the Mission Inn, a building just dripping with California history. Despite its name, the grand old hotel, which has been photographed ad nauseum, was never one of the famous missions scattered along the California coast. The hotel is known for its many famous guests, movie stars and presidents among them. Get all the details and some history, as well as special events, at missioninn.com. An overnight stay is a little outside my budget and I have not, as yet, been invited to one of the many weddings that take place there.
Check out some of the online resources if you're looking for a history lesson or check out the museum here: riversideca.gov A walking and parking map as well as many other useful tips can be found at riverside downtown.org
It's not the only magnificent building in the area, or even the most breathtaking. The museum is within walking distance, interesting cafes abound, a city library is in the neighborhood, and an excellent used bookstore is waiting to be discovered around a corner.
Parking gets a bit pricey so look for a garage that offers the first ninety minutes free. I believe parking is free after six. There's lots of places for the little ones to burn off some energy. ALWAYS check the weather before you head out. A nice comfortable 82 degrees by the coast could mean 100 degrees inland!