I don't have a single perfect day. There are several types of perfect days:
Perfect day with the kids - out doing something they really enjoy, no fighting, lots of laughs.
Perfect day with the wife - no kids, no pressure, no clothes, lots of laughs.
Perfect day with friends - this one I have had several times as we try and get together at this nice beach in Maine each summer. It is a relaxing day every time.
Perfect day alone - Kick back, play some computer games, read a good book, ignore the "Honey Do" list and not get crap for it later.