Basilica of San Donato. It is one of the most ancient church in the Venetian lagoon. Inside you can admire the wonderful polychrome mosaic floor. It was restored to protect it from the flood in 1970s with the help (money) of an american couple of benefactors.
Glass Museum. It is located in Palazzo Giustiniani. It is an interesting tour. There are the most important masterpieces of Murano glassmaking.
Church of San Pietro Martire. Inside you can appreciate paintings by Jacopo Palma il Giovane, Giovanni Bellini, Tintoretto.