What can i do with my dogs?

I have a chocolate lab/border collie mix, and a yellow lab/german shorthaired pointer mix. They are both under 2 years and very energetic. We have a large fenced in yard where they play. I also try and bring them swimming on hot days. And lots of off leash walking through trails and bushes. They love being out, but id like to find other things i can do with them. I dont trust biking with them both attached.. and ive gone to dog parks and stuff lots. Is there sports or anything they can be involved in? I live in Ottawa Ontario