What advice would you give to a computer science major student?

• Do a research internship, preferably in academia
• Do an internship with a big established company like Google/Facebook, preferably in their valley office
• Do an internship with a startup having a good technical team, preferably local
• Do at least one meaningful open source project. Google Summer of Code is a good option.

If you do all this, hopefully by the time you would graduate, you'd know precisely what clicks with you and what you want to do further in life.