I voted for all except other, but like Kay, some only apply to certain dogs.

Walks - All four

Off-leash running (or on a long leash) - Tango is the only one of my 3 allowed off leash, Keeva doesn't get either a long leash or a chance to be off because she's still a pup and I don't trust her and Winston gets a long leash, I'd never trust him off leash...

Playing inside (squeekies, rawhides...) - All four

Playing outside (frisbee, ball...) - Tango and the Dobes (Tia doesn't play much...)

Dog Park - Tango and the Dobes usually, sometimes Tia goes but not often.

Swimming (or wading, if your dog is not a swimmer) - Tango's the only one of my dogs who will go anywhere near water so I take her swimming for fun.

Agility, Flyball, other dog-sport... - I don't compete with any of my dogs in sports, I'd lvoe to but for now I just do agility with Tango in the yard. Keeva I'm sure will love it aswell but she's too young for the jumps...

Training new tricks - Tango and the Dobes (Tia doesn't think learning is at all fun...)