Fairytale Town is wonderful for the kids. It's a collection of play structures related to several popular fairytales. Most items are small enough for my 2yr old, but fun for my 6yr old. Favorites are the "Crooked Mile" which is a elevated, cement walking path that winds through a 'forest', "Owl's house" (from Pooh bear), a treehouse and slide with stairs to top and the pirate ship. My daughter always asks about the face painting, which is an additional charge.
Supposedly, the park has special events through out the year. Check the site for schedule, but I've seen advertisements ice cream socials, live music, plays and puppet shows. I haven't seen any of these in person.
The park has lots of shade, so still fun in the hotter summer months. Food is mediocre (like Sac Zoo across street) but reasonable. Hot dog, chips and drink were about $5/person. Hot day? Grab an ice-cream treat!
Lots of free parking, but it's shared with the Sacramento Zoo, Fun'derland (amusement park rides) and surrounding park so it fills up quickly, get there early.