Wow this is a great question and super subjective. I'd put Super Mario Bros and Minecraft at the top of my list. You could probably make a strong argument for GTA III and Modern Warfare 3 as well, right?
Steak
Going to Washington DC when I was very young. I enjoyed all the arts, history, and monuments. Toured the Capitol and Supreme Court. Awesome experience.
It's probably worth $50-$75. It's old and out of date and technology depreciates quickly. I sold my Xbox 360 for $60, was just happy to get it out of my house and free up the space. Otherwise, I would have donated it.
Usually relaxing watching TV or cleaning/organizing. I like movies too.
If you could win an Olympic medal for any sport, real or fake, what would it be?