I would like to visit the island of Murano in Italy to check out the glassblowing -- we may not need a tour for this, but here's the description of one tour in case we want to steal ideas: https://www.tripadvisor.com/AttractionProductReview-g187870-d11449780-Murano_Burano_Islands_Guided_Small_Group_Tour_by_Private_Boat-Venice_Veneto.html
Jenny is there now and I'll get the scoop from her when she returns next weekend.
Absolutely agree. We did not get there last visit and I definitely want to. I’m waiting for feedback from Through Eternity on Venice options. We may or may not want your vs. self walking - needs further consideration :)