In Arnold Creek

Arnold Creek Natural Area: http://www.portlandonline.com/parks/finder/index.cfm?ShowResults=yes&SearchText=arnold+creek
Maricara Natural Area: http://www.portlandonline.com/parks/finder/index.cfm?action=ViewPark&PropertyID=249&subareas=5
Tryon Creek State Natural Area: http://www.oregonstateparks.org/park_144.php
             Friends of Tryon Creek: http://www.tryonfriends.org/

Nearby

Wilson outdoor pool: http://www.portlandonline.com/parks/finder/index.cfm?action=ViewPark&PropertyID=863&subareas=5
Gabriel Park Community Center with indoor pool: http://www.portlandonline.com/parks/finder/index.cfm?action=ViewPark&PropertyID=136&subareas=5
Holly Farm skate park and playground: http://www.portlandonline.com/parks/finder/index.cfm?action=ViewPark&PropertyID=1239&subareas=5
Marshall Park: http://www.portlandonline.com/parks/finder/index.cfm?action=ViewPark&PropertyID=252&subareas=5
Multnomah Arts Center: http://www.portlandonline.com/parks/finder/index.cfm?action=ViewPark&PropertyID=292&subareas=5