I love walking! I remember a Golf Digest article from a year or two back touting the health benefits. There are two courses nearby that are particularly hilly with some walks between the tees so we will ride. Try to play walkable courses in the Spring and Fall when it is cooler out to stay warm. We often ride when on vacation either because the resort mandates carts or because we are on vacation! Anything over 90 I also want to ride. I do have a better rhythm, mental state, and stay loose when walking.
I think single rider carts, Finn scooters, etc are probably the fastest way to go around a course as long as it is not cart path only. Foursomes in carts with even 4-5 holes CPO seem to just back everything up. After getting yelled at by a pesky ranger for pace of play at a CPO course while walking along side two riders, I asked the ranger to watch a couple of holes. I walked up to my Ball while the others would drive on the path to roughly each person's ball then pull a club then go get distance them go back to the cart rinse and repeat. Got a nice apology from the ranger.
I think single rider carts, Finn scooters, etc are probably the fastest way to go around a course as long as it is not cart path only. Foursomes in carts with even 4-5 holes CPO seem to just back everything up. After getting yelled at by a pesky ranger for pace of play at a CPO course while walking along side two riders, I asked the ranger to watch a couple of holes. I walked up to my Ball while the others would drive on the path to roughly each person's ball then pull a club then go get distance them go back to the cart rinse and repeat. Got a nice apology from the ranger.