Go here every summer. Great sized park, great slides, and plenty of lounge chairs. Arrive early to get good seating. Yes, the water is cold but after a while you get used to it!
If you use the lockers, be sure to cover your code/combo, my stuff along with my friends got stolen from our locker we paid to use at their facility, which coincidentally does not have surveillance
If you're gonna get a season pass go to Costco down the street and get a premium which includes a inner tube each time you go for about the same price a a regular season pass.
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Six Flags Hurricane Harbor Concord
1950 Waterworld Pkwy (at Hotel Way) Concord, CA94520 United States