Christmas at Upper Canada Village is one of the best places to see lights during the holiday season. I usually end up going after Christmas to see the Alight at Night festival to extend the Christmas season a bit. I love just walking around seeing all the pretty lights and there are also horse drawn wagon rides.
One of my favourite fall activities is hiking in Gatineau Park. It’s really the best place for hiking around Ottawa and only a 15 minute drive from downtown. The best trail is the Wolf Trail (trail 62) since it’s one of the longest at 8.3 km and there is a decent amount of elevation with great views. In total it takes about 3 hours.