I pay for my membership yearly, it's around $500. I believe you can go online and purchase a 1 zone yearly pass for $455. Or add another zone for an additional $50.
There are great deals at thousand trails. I got a 2 year pass for 200 dollar's. But it depends on what zones you want to include plus other available upgrades. But ponderosa is a great park has something for everyone. We love to go to the river and just adventure out to the islands. Great times!
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