is murano accessible? how do we get there from st marks?
also, since we will be there just for a day, what are the top 3 things to do there?
lastly, whats best way to go to the airport from st marks? thanks!
There are free water rides - small motorboats - to bring you back and forth. You can also have stuff packed and shipped off to the Phils. You get it here in 2 months.
The Duomo/San Marco, dinner at the piazza in front of San Marco, museum, walk around - it is an enchanting place, watch the sun set -
From the airport - by train. Then you move around via the big water taxis. Be prepped to do a lotta walking
What else? Mosquito repellant!
Do not go during the rainy season there - the dirty water reaches almost to your knees around the piazza area.
Dance on the piazza - there are at least 4 piano & strings groups playing around the San Marco piazza at night.
Would this be in Murano? Do you have to pay to watch?

No pay but thy will lean on you to buy something. hehe
i didn't have to go to murano. it's just in one of the stores around st. mark's basilica. there are several of them.
i bought a murano watch from one of the souvenir shops. 
If you are not interested in big items like chandeliers - you can skip the island and glass blowing. Lots of small shops ringing the piazza, and in the small streets.
We never did an airport to VENICE thing.
From Milan to Venice, Florence and Pisa, then onto Rome.
All by train.

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To clarify - the free small water taxis belong to the bigger companies on Murano. You are fetched at the small pier of your hotel, then land on the company's private pier. Arrange with your hotel. should you deide o roam round more on Murano island, you can take the bigger water taxis tht operate like buses - several stops along a route.
There is no way you will get around Venice - a group of small islands - without going on these public water taxis - yes, you pay. gondolas will cost you more.