Bike On Australia lists some great Noosa Family Rides. 1. The Surf Beaches Trail from Peregian Beach to Noosa Junction 2. The River Ride from Tewantin to Noosa Heads 3. The Waters Ride - the Noosa Waters circuit 4. The Weyba Creek Wanderer - from Gympie Terrace to Noosa Junction. Click on the link to their website for maps and more info.
Kurilpa Bridge ride is great family ride because it is so close to Southbank (for swimming and playing in the playgrounds) and the awesome Museum of Modern Art which has so many great things for kids to do.