Oh man, that would be a lot of fun! Make sure to get Daschunds, Chihuahuas, Pugs, Pomeranians...
My little guys always just used the yard and didn't care much at all for going on walks. I could just go out back with a tennis ball and wear them out in 5 minutes. They're both little lazy bastards like their daddy! Well, Jerome was anyway.
But Nikoh is sure keeping me exercised, both by playing in the yard and going on long long walks. When she's being mellow, she'll come over and put her front paws on you because she wants to have her belly rubbed. She'll stand there like that for a good 10 minutes or so before gently getting off and lying down. But those moments are only early in the AM and not long before bed.
Otherwise, she can be a dang terror! She's still chasing Nero, but that little bastard loves it, and antagonizes the more she nags him. Never a claw though, Nero is just thrilled to have a friend that responds to him.
She's got about 60 holes dug in the yard already. Not even deep, about 6 inches to a foot each. Can't really bring the Chihuahua with her still as she's too rough, and then little McNasty bites her!! She's not a bad dog to walk with, she's already learned to not pulll too crazy and she doesn't try to run off (even though never off the leash anyway). But boy, she can walk for days if you let her! And if she poops, just kinda not the same size as being used to cleaning after a chihuahua!!
So take the little guys and gals!!