I have been lucky enough to have met a number of celebrities over the years through either the theatre or movie premieres. Probably the most famous of them was Neil Armstrong back in 1999. So a more relevant question for me would be "where would I most like to travel to" rather than "who I would like to meet".
The list for this is quite long but I have narrowed it down to my top five.
1. Touch a Moai on Easter Island.
2. Climb the highest mountain on at least 4 continents.
3. Roadtrip around all 50 US states (yes I know I will need to fly to Hawaii and probably Alaska).
4. Spend the night at Machu Picchu Sanctuary Lodge in Peru so I can have a few hours alone at the ruins before the 100's of tourists arrive in the morning.
5. Explore the ancient treasures of China such as the Xian Warriors, Great Wall, First Emperors Tomb, etc.