Timberlane Park & Youth Activity Center

This is one of the best parks in Hesperia — a real diamond in the rough. Apart from the playground and the baseball field, the park is entirely covered with grass and trees, which provides fantastic shade in the summer heat. There are multiple picnic tables spread out, which makes this place ideal for parties or entertaining. (One park bench is wheelchair accessible.)
What I really like about this park is the boxed-​in feel. The only vehicular traffic comes from the direction of the parking lot on the east side so if my kid takes off running on the grass, I know he’ll eventually run into fence on all three sides and circle back. There’s a good line of sight pretty much everywhere so I can sit on the bench and see him at all times. The only exception is for using the water fountain or restrooms, which is located on the other side of a building (i.e. the parking lot area for the the baseball field).
The playground equipment is great. It has everything. Big kid and little kid jungle gym, swings, and some type of see-​saw. Everything is in good repair. No issues whatsoever.
The Hesperia Park District also hosts events here such as Mommy & Me classes and a variety of pre-​school/​kindergarten programs. You can sign up for these events on their website. I have no direct experience with their toddler programs (they filled up too quickly each time we tried to sign up), but I have seen their occasional gatherings at the park from time to time.
It really is a fantastic park in a quiet neighborhood just waiting to be discovered!