When I lived downtown, I used to love to walk my dogs to Cope Park. We'd walk (leashed) through the forested area, then cap off the walk with a nice tiring play session in their large dog run. This is one of the only places I know of in Juneau that has a completely enclosed area to let your dog off-leash to play with other dogs. Though it is mostly sand/dirt, my dogs don't care--they love being able to run around unrestricted! There is also what looks like a nice and well-kept playground for children, as well as a maintained path down to the creek for your dogs to get a quick drink--or bath.