Parvo is such an awful, horrible thing. No, not much more you can do than bleach the walkway-I would look around your yard for diarrhea/small poops and dispose of it if you find any. Your dogs are vaccinated, so I wouldn't be overly concerned. If one of your dogs seems to be "down in the dumps" or has a stressful day or something, I wouldn't bring them around that area, as the immune system might be weaker and therefore increasing the chance of parvo infection. Although remember that vaccines carry no guarantee that your dog won't get the virus, and if they start vomitting/diarrhea/lots of eye goop/lethargy, any of those, get them straight to a vet. And I wouldn't bring an unvaccinated dog or a puppy around that area either.