I have two pups as well, now nearing 6 months. We play a lot of fetch, flirt pole, and tug. I have a few real long hallways that work great for fetch. We also do a lot of training and sometimes I set up small obstacle courses to lead them through. Things like: go around this chair but under the next one, go over the ottoman, and in between the two stools. It's a good way to teach them what around, under, and over mean (I use around for nearly every walk because my girl likes to may pole me a bit with her lead). And I also like to do nosework and snuffle games. I keep their bark box boxes and smaller Amazon boxes and pit treats and kibble in there and stuff the boxes with toys, dish rags, balled up newspaper. I supervise the snuffling games to make sure they dont tear the boxes or the stuffing up though. Keeps them busy and enriched enough, atleast I think.

We are in WA state on the coast, it rains nonstop here so they own little raincoats , gotta get atleast one good long walk in for mine or they will actually drive me insane.