In the center of Alpena, along the bipath running adjacent to River street, tand across the river from the NOAA Sanctuary, Rotary Island can easily be accessed from downtown.  It's a beautiful oasis of incredible blooms!  Don't miss this gem! 
Worth a short walk from downtown, right on the Thunder Bay River, visible from the 2nd and 9th avenue bridges.
Photo credits: Mike Kelly and Joanne Gallagher