There are plenty of sidewalks to walk on at OKW. You cannot walk across the golf course, so you must stay on the sidewalks. There are some areas where the sidewalk ends and there is a crosswalk to go to the other side of the street to rejoin the sidewalk. The longest walk from the end of South Point to the Hospitality House area is about ten minutes. An easy, pleasant walk. There is no reason at all to walk on the roads where you could get hit by a bus or car.
The biggest problem with trying to drive to the main pool is the lack of parking. Parking is very limited there with guests checking in or dining. If you cross the street, you are taking up spaces at the villas for those guests.
You can hop on any bus and get to the main pool. Then walk across the bridge to Peninsular Road bus stop and catch a bus back to your area if you don't want to walk.