Hmmmm. My top 5 would be (in no particular order):

1. Actually smoking some herb in the dream and actually feeling an effect in the dream.

2. Consiously willing items to appear. e.g.weapon

3. Exploring the underwater ocean in a lucid dream. It was beautiful.

4. Having a showdown with The Emperor (from star wars). Ironically enough, i ended up gettin fried....maybe shouldn't mess with him next time.

5. Being able to use telekenesis in dreams.