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Oregon Zoo

Seaside Aquarium - ruled out; shosho doesn't like petting zoos

Portland Aerial Tram

Freakybuttrue museum - maybe too scary

Oaks Amusement Park

OMSI (if not too expensive)

Monkey King ("kids cafe" kinda place)

Evergreen Aviation museum and water park

Blue Lake Regional Park (water fountain)

Mt. Scott Community Center & Pool (a huge indoor pool)

Fishing (nearby parks, U catch near Sandy)

Sturgeon watching at Bonneville Dam

Playing in the creek at the top of Multnomah Falls

Kayaking / Canoeing