I've only had a quick snack so far. I think lunch is still in the works at this property as they only offer buffet lunch (but have been willing to accommodate smaller request). Tomorrow, we are having dinner at the restaurant, which sits by the water, so will let you know how that is.
The boat service is only to the Danieli.
Also to note, service runs from 9am to midnight. I think between 11am and 10pm, the service runs every 20 mins. "Off-peak" times it is every 40.