Photo: EncMstr, CC BY-SA 3.0 Free walks & trails in Portland
Photo: EncMstr, CC BY-SA 3.0 
Photo: EncMstr, CC BY-SA 3.0 Hoyt Arboretum
Free, always
Photo: Gary Halvorson, Oregon State Archives, CC BY 4.0 Tom McCall Waterfront Park
Free, always
Photo: Tony Webster from Portland, Oregon, CC BY 2.0 Alberta Arts District murals
Free, always
Photo: User:Cacophony, CC BY 2.5 Vera Katz Eastbank Esplanade
Free, always
Photo: bluecraze378, Public domain