Mast Park
✓ Last confirmed for the 2025 season
Where: 9125 Carlton Hills Blvd, Santee, California
When: typically open in warm months (check before visiting)
Hours: typically daylight hours
Cost: free
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Tree-house-inspired towers with some of the area's tallest slides anchor this riverside Santee park, which splits equipment between ages 2-5 and 5-12 and adds a Nature Discovery Area. Nature trails, ping-pong tables and a weekend food stand extend the visit.