I have five nights booked at the Hilton Molino Stucky next year on points. Originally I was thinking of booking at the Hilton Garden Inn Mestre for the sixth night before our 11:30 AM flight but I am reconsidering. The HGI is pretty much the same trip as the airport although we would not have any time pressure to get there the day before our flight and we would take their shuttle to the airport in the morning. My plan was to checkout and store our bags at the Hilton Molino Stucky and go to Mestre after a day of sightseeing.
If I stay put at Molino Stucky I figure I would have to leave around 8:00 AM the morning of our flight to insure I get to the airport two hours before our departure - or just bite the bullet and take a water taxi.