Em: Infinity Mirrored Room -The Souls of Millions Light Years Away- is a must see @ The Broad! It’s a quick 45 sec visit, but immersive enough to experience. Go to iPad kiosk to join the virtual queue.
Em: Don't just cross the bridge, go up to the tower. Quite some steps but worth it. The view of Charles Bridge stretched all the way to Castle is stunning! Oh, and it's free on 1st day of advent and on.