The Zambon's two children, Christine and Kim, followed in their mother's footsteps and began helping out at an early age. In 1965, the property added an open-to the-public restaurant known as The Three Coins Dining Room. The property also began to offer The Holiday Plan, a modified American plan, to guests.
Over subsequent years, Holiday Acres offered winterized cottages for those who enjoyed winter activities such as snowmobiling. A new field house was built following an extensive fire and was designed by associates of Frank Lloyd Wright. Holiday Acres Camping Resort was added in 1971 and included a campground with 70 sites that included full sewer, water and electrical hookups.
In 1971, Doris and Jim realized a lifelong dream of bringing great jazz to the Northwoods. Buddy Rich, Woody Herman, the Count Basie Orchestra, the Duke Ellington Band and trumpeter Maynard Ferguson, among other jazz greats, played at Holiday Acres. In 1986, Holiday Acres held its first annual Jazz Fantasy Camp, an event that has occurred annually since. The two other perennial jazz events at Holiday Acres are the Thanksgiving Weekend of Jazz, the Mother's Day Weekend of Jazz and the Northwoods Jazz Camp Jazz Party.