We walk over at least once on every trip. We just walk around the lake until we get to the Swolphin, cut through the property, and cross the street. It's an easy, pleasant walk.
There are two courses at Fantasia Gardens, one is a typical mini golf course suitable for all ages, the other called The Fairways is extremely difficult and only for very advanced players and then will still be very difficult.
The two courses at Winter/Summerland are both typical mini golf courses, one with a winter theme and one with a summer theme as the name implies, both are suitable for all ages.
We really enjoyed the walk. It gave us a chance to see the pool at the Dolphin. We played the Fantasia side. And we used our AP discount! DVC also has a discount if you don't have APs.