Fred
Casino Di Venezia now owns all 3 places and they use the same chips and cards at each place.

Worth pointing out that the first one you mention is in Veneto, not Venice. 10 minutes north east of Marco Polo airport - ie nearly an hour from Venice center.

The historical casino on the island does of course have a dress code but I havnt had to pay to get in the last couple of times.

The 3rd casino on Lido island only opens for a couple of months during summer now. In fact that island seems to be virtually shut half the year.

Doubtful John will have enough time to do that much anyway if he wants to see the main sights. He had better take his walking shoes!