Best Farmers Market on saturday mornings, active playground, safe place to take children for a bike ride or run the 3 mile loop. Afterwards you can go to Franks for ice cream.
Just a great open space, good trails, really nice playground and even usually plenty of parking even though it can get quite crowded. There is so much open space you can always find a spot.
Over all the best park in the Albany area. The Hoffman Family Maze is great for family fun. They also have food and drinks at the club house for under $1.50.