For Kids:

1. Guadalupe River Park: Explore playgrounds and walking trails.
2. Municipal Rose Garden: Enjoy beautiful flowers and open spaces.
3. Japanese Friendship Garden: Stroll through peaceful gardens with koi ponds.
4. Emma Prusch Farm Park: Visit a working farm with fruit orchards and farm animals.

For Adults:

1. San Jose Museum of Art: Free admission on the first Friday of each month.
2. Rosicrucian Egyptian Museum: While the museum has an admission fee, you can explore the beautiful grounds and Peace Garden for free.
3. San Pedro Square Market: Enjoy the lively atmosphere and sometimes free live music.
4. Los Gatos Creek Trail: Bike or walk along this scenic trail connecting San Jose to Los Gatos.

Remember that while these activities are generally free, some may have associated costs like parking fees or optional donations. Always check the latest information before visiting, as policies and hours may change.