Not only watching my sons and daughter sleep, but when they give you that special extra hard hug.
I also enjoy laying in bed with my wife laying her head on my chest and just listening to her breathe as she goes to sleep.
Staring out over the Pacific ocean, listening to the waves crash.
Listening to the wind blow through the trees.
Watching a lightning storm come up over the mountains in Verde Valley, Arizona.
Watch a river start to swell with water from the storm or snow melt.
Being on an upper floor of a tall building in Las Vegas at night, watching the lights of the city.
Riding rollercoasters, my favorite being The Beast at Kings Island in Ohio.
Seeing how huge the world is from the window of an airplane.
Smell of a good meal coming together.
Looking out over the land after a new snow fall.
Seeing your garden budding all of the future fruits you'll harvest from it. With no weeds in sight.
Running your model train through its newly built terrain.
Watching your kids have a blast playing in the ocean, with each other.
Seeing your child learn something new.
Watch your youngest stare in wondrous glee at the Great White Shark swimming by in front of him for the very first time.
Watching your daughter draw picture after picture, and see how much she improves every time.
Lots of others.