Murano is just a short vaporetto (water taxi) ride from Venice, but this quiet island is a world away from often touristy Venice. Murano has its own Grand Canal, along with fascinating shops and sidewalk cafes. Murano also has a marvelous glass museum and several glass factories where you can watch these artists work in their own environment.
If Venice is too busy or overrun with tourists, buy a vaporetto line 41 or 42 ticket to Murano. It's worth the ride!
We purchased a 24-hour vaporetto ticket when in Venice on the Carnival Liberty. It allowed us to ride everywhere--including Murano--on the one ticket.