A great way to spend the afternoon in Paris? Grab some cheese, a baguette and some wine from the shops on the Champs Elysees and head down for a picnic in front of the Eiffel Tower!
The trolley tour of Boston, offered as an optional, is the best way to see the entire city. Take it at your own pace, but I would suggest stopping off at the USS Constitution and Fenway.
The Tirol is one of the most beautiful parts of the world. If you visit Hopfgarten, visit the trout farm - you can catch a fish, then have it for lunch!