Literally just a list of the easiest hiking trails in each part of Ottawa. Enjoy!
Gatineau
The Lac Leamy Pathway (2.4 km)
The Pioneers Trail (1.4 km)
The Lauriault Trail (5 km)
The Sugarbush Trail (1.9 km)

The trails in Gatineau Park are perfect for families!
East End
Hiking Trails at Petrie Island (3 km)
The Mer Bleue Boardwalk (1.5 km)
Trail 51 in the Ottawa Greenbelt (7.5 km with shorter loops available)

Hiking at Petrie Island.
South End
Pinhey Forest Trails (3 km)
Pine Grove Forest (5.6 km) – badly damaged in the Derecho storm.
The Stonebridge Trail (5 km)
Chapman Mills Conservation Area (3 km)
West End
Mud Lake (3.5 km)
The Jack Pine Trail (2.25 km)
The Lime Kiln Trail (4 km)
The Rockhopper Loop (3.6 km)

The Rockhopper Loop is a short, fun trail.
Happy hiking!