Sloan's Lake had a long history of entertaining Denver residents with boating, fishing, swimming, and a steamboat canal built in the 1870s. In 1890, Adam Graff and his partners opened a new park on the shore of Sloan's Lake that would eventually become Manhattan Beach. Originally created as a summer pleasure resort with a highly respected summer theater, boating, fishing, and music, the park quickly expanded to include typical amusement attractions,...