Okay so my family and I are planning a trip to Italy around March 18, 2019- April 2nd. The plan is to hit Venice, Florence (and neighboring Tuscany towns), Rome, and Positano. As far as plans go, I have questions about whether certain places are open during this time given its offseason (which is honestly why we chose March, less heat/traffic). We originally planned the last week of March and the First week of April (March 25-April 9th) but had to move it due to our conflicting schedules, and thus I worry about the week making a difference as far as our plans. I have flexibility as far as activities go but here are my basic (and what one may consider to be the popular) desires for each city that I question if I can do during the time we are going.
Venice- gondola ride (evening time); this will likely be the first city we visit. We mainly plan to stroll through the streets & shop, but of course, we'd like to take a gondola ride. are they open/operating then?
Florence- cathedrals, museums. Are these open during this time frame? I'd like to see much of the art and churches if possible.
Rome- Trevi fountain, ruins, and the Colosseum. these are open year round right?
Positano- This will be the last stop of the tour. We plan on doing some hiking, shopping, exploring of other towns in Positano, and then taking a ferry out to Capri and the Blue Grotto. I've seen conflicting information about when ferries operate during the 'winter' months. I've read that the tours normally start after Easter (which is the 21st next year) my question is, is this true? will there likely be no way of accessing Capri and the blue grotto during this time frame? We debated staying in Sorrento since the word is they start sooner but I'm really set on Positano for many reasons.
Any advice about all this? I appreciate all the help in advance. I hope this time frame will be good tourist and weather wise, but really hope things will be open. We do not have the ability to move the trip dates (outside of reason) due to us already asking time off, planning, etc.