OKW and SSR also have bus AND boat service to DTD. The boats run on the hour until about 4pm when it increases to 2x per hour.
The path that dianeschlicht mentioned could be used to walk between OKW and SSR, but I don't think there are any other resorts within walking distance. POFQ would be the next closest, but it is across a main road from OKW. I believe Disney discourages walking on any of the main roads.