My home made saddles. I use what the upholstery guys call 'motorcycle foam' which is a very high density foam rubber. 2" is nice but 3" feels like sitting on a cloud.
Many won't agree but I really like the ride a set of ape hangers gives. They increase my riding comfort on long straight rides. They just feel right.
Big fat soft tires are also a real plus when it comes to making for a comfy ride.
And, room to stretch out my legs.
Just to add, a layback seatpost is an awesome accoutrement. Can get really tiring holding your self up on your hands and feet when you are almost over the pedals. Makes a huge difference to be actually sitting rather then more propped up.
I had no idea what a difference one would make until Tom sent me one he made.