[ Alsace ] Open Question : Attractions in Strasbourg?

I will be accompanying a group of students to the European Parliament in Strasbourg and will be staying at SAS Jean Sebastien Bach (Orangerie). We will have up to a day and a half of free time. What must-see attractions do you suggest? The students are 14 and 15 year olds. Thank you :)

Source: http://answers.yahoo.com/question/index?qid=20120427095857AATcvtH

Jennifer Lopez Kanye West Christina Aguilera