As lumbering declined in the 1900s, tourism boomed around Glen Lake, which travel writers called the "Switzerland of America." In the 1920s, D.H. Day of Glen Haven planned an exclusive resort on Alligator Hill, building an 18-hole golf course and clearing land for an airstrip. The development was to include tennis courts, bridle paths, a polo field, ski jump, toboggan slide, and more than 100 estates described as "ideally restricted." That vision ended after Day died in 1928 and the stock market crashed a year later, causing investors to withdraw their funding. By the 1940s, residents and officials were envisioning the land instead as a park for everyone.