Palms Book is a rewarding side trip for the vacationer touring the Upper Peninsula, for here can be seen one of Michigan's alluring natural attractions -- Kitch-iti-kipi, The Big Spring. Two hundred feet across, the 40-foot deep Kitch-iti-kipi is Michigan's largest freshwater spring. Over 10,000 gallons a minute gush from fissures in the underlying limestone. The flow continues throughout the year at a constant 45 degree Fahrenheit. By means of a self-operated observation raft, visitors are guided to vantage points overlooking fascinating underwater features and fantasies. Ancient tree trunks, lime-encrusted branches and fat trout appear suspended in nothingness as they slip through crystal waters far below. Clouds of sand kept in constant motion by gushing waters create ever-changing shapes and forms, a challenge to the imagination of young and old alike.