AARP Maine is hosting a series of free summer events. On Tuesday, July 24, enjoy a nature hike at Viles Arboretum in Augusta. The 90-minute tour begins at 10 a.m. at 153 Hospital St. To sign up, go to aarp.cvent.com/VilesArboretum.

Walk along the Kennebec River Rail Trail every Thursday, starting at the boat landing in Hallowell at 8:30 a.m. The walks go toward either Augusta or Farmington, and you can walk as far as you are comfortable.

Watch a full moon rise over the Eastern Trail during a guided hike on Sunday, Aug. 26. Meet at 8 p.m. at the trail’s parking lot at Pine Point Road in Scarborough or at Southern Maine Health Care’s rear lot off West Cole Street in Biddeford.

For details, go to aarp.org/me.