1. Upper Canada Village - fun for all ages. I went many times growing up, and have been twice with the boys. Plan to spend 3-5 hours at the village to see everything and immerse yourself in what life was like in the 19th century. Pack a picnic and enjoy their picnic area, or purchase food from the cafeteria, cafe or restaurant.
2. Parc Omega - we haven't had the chance to visit, but everyone raves about it. (You can read what Becky from A Little Bit Of Momsense thought and if you want to read in french, you can check out Entre 2 Escales for their thoughts) Stock up on carrots (costco is a good place to go) and feed some of the animals as you drive along.
3. Saunders Farm - outdoor family fun! Splash pad, jumping pillows, mazes, tractor ride and play structure. Pack a picnic (or purchase food onsite - cash only) and spend the day. Remember to reapply sunscreen or you may come home with a burn. We always have a blast when we visit.
4. Mill of Kintail - I haven't been here since I was in elementary school, it's a popular place for field trips. Hike the trails or visit the museum and see works of art from Canadian artists. Just a short drive West from Ottawa.
5. Go hiking - Gatineau park is a great place to put on your hiking shoes and get out in nature. A short drive from Ottawa. In addition to hiking, you can bike, camp or check out the Mackenzie King Estate.