I also purchased the Joe Cool Club certificate. I thought if it comes with ERT, that's reason enough. The transferable parking pass worked out good for me also because I don't take the same vehicle every time I go there, it just all depends on who I go there with. I also bought a Combo Pass even though I've never been inside of Soak City, but buying the season pass certificates at that low of a price I figured why not. At least I'll be able to cool down on really hot days if I don't really feel like doing a ton of riding.
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http://sapman.homestead.com --- My stupid website