I absolutely love Calico Basin.
First of all, it's not that far from my house. Also, it's far enough (and hidden enough) that it keeps the nerds away. Plus my dogs love it, which makes it extra awesome for me.
Really what I love about it is the fact that it's just a naturally awesome place. I like when I go and I hear the birds singing, I see the lizards scamper, and occassionally see a relaxing turtle. It's great. There's nothing "Las Vegas" about it, really.
This place is also equipped with really easy trails as well as picnic tables, little bathrooms, and barbecues.
Come here, bring your kids/dogs (and water bottles), and enjoy it. You'll love it.