J's Amusement Park is a defunct amusement park in Guerneville, California. The park was founded by Jay Skaggs, and later run by his son, Michael. The park featured a rollercoaster, a mad mouse, a miniature golf course, and several other attractions. Due to rising costs, the park closed in 2003, but is still used for special events, including a [haunted house] event each Halloween called "Dr. Evil's House of Horrors."