Best in life is having a child, seeing him/her grow with all the values you instill... and then lead their own life responsibly!! =)
The best thing in life is accomplishing something, or making a mark on the world so when you are old and in your final years you can really appreciate that your life was worth it, that you had a meaning and that you've made a difference.
"The greatest pleasure is to vanquish your enemies and chase them before you, to rob them of their wealth and see those dear to them bathed in tears, to ride their horses and clasp to your bosom their wives and daughters." - Genghis Khan
"To crush your enemies, to see them driven before you, and to hear the lamentations of their women". -Conan- to the Mongol General-
Mongol General: Hao! Dai ye! We won again! This is good, but what is best in life? Mongol: The open steppe, fleet horse, falcons at your wrist, and the wind in your hair. Mongol General: Wrong! Conan! What is best in life? Conan: To crush your enemies, see them driven before you, and to hear the lamentation of their women. Mongol General: That is good! That is good.
Best in life? Hmm... I think, there is no "Number 1" thing in life. Life consists of ups and downs, but the ups are what makes life so enjoyable and unique.
Family. Without family, life is nothing and has no meaning. Enjoy every second you have with every member of your family (even if you do not enjoy spending time with them)