My husband and I will be at the Viking Spirit for embarkation at 9AM on June 8, 2014. According to our travel agent, we can board & Viking will store our luggage. Would we be able to visit the Eiffel Tour at 10 AM and go to 2nd floor & Summit & be back at the Viking for lunch? Lunch is served from 11:30 to 1:00 PM. What would be the fastest way to travel back & forth from the Eiffel Tower? Thank you for any assistance.