We went all through Italy and tipped no one but the Adventure guides per
ABD's instruction.
Drivers
Bellmen
Luggage handlers
Waiters / Waitresses
All of the folks that would normally be tipped, were included. It never felt odd or uncomfortable.
Now, if you are arriving early or staying after your Adventure, tipping is not included and you are on your own. Also, when you venture out on your own while on your Adventure, tipping is not included
We were told that ther were different tipping guidelines in Italy. If you take a taxi and the fare 11.50 euros....it would be customary to bump it up to 12 euros, but the driver would never expect more. In restaurants, there is usually a service charge added to you bill. If you received tremendous service, you might leave a another euro or two, but you would not be expected to tip on top of the service charge. This will obvioulsy be different in the US.
As far as the folks handling your luggage, after the guy that picked us up at the airport, we never saw anyone touch our luggage. we know they did, but not where we could see. Our luggage was in our room when we checked in. We were asked to put it outside our door prior to leaving for breakfast on days when we were moving to a different hotel. It would be in the next hotel when we checked in, so there was really no one to tip.
One thing I would recommend is to bring a couple little thank you notes with you. It was something we did not remember to take and we sort of scrambled in Venice to find something suitable. There was not a card store nearby and the cards we did find were in Italian (and we did not know what they said). Handing the guides cash seemed uncomfortable, so we improvised, but it would have been nicer to have a small thank you note.
Kevin