Going independent
I recommend buying a vaporetto (public transport) ticket valid for 24 hours; once you arrive, you can decide what to visit, such as the Glass Museum and glassworks in Murano, the small workshops and lace workshops in Burano, and the basilica and Attila's Throne in Torcello. There are also excellent restaurants on the island of Torcello: they are expensive, but really worth it.