One of my favourite places in the world, I adore this place, it's magical.
Once you have visited St Mark's Square, get off the tourist trail and throw your map away. Let the alleyways, bridges and canals dictate your day. Every corner you turn you will be spell bound by a different sight or square or church dome or intricate doorway.
Once the sun goes down there is a huge variety of nightlife and something for everyone.
One of the best ways to see Venice is by waterway. Gondolas aside, if you are lucky enough to sail into or out of the port at either sunset or sunrise the sun dazzling on the uneven terracotta roof tops is just breathtaking.
TIP: Drinking outside a cafe in St Mark's Square will be double the cost of the same drink off the square!