first of all welcome in Italy! ( Whenever you arrive!) I don't know all the places you are vising in depth, but I'm sure I can give you some advice.
Venice: Are you going to land in Venice? If you do, try to get to Venice centre by train. Doing so you could have a first try of the laguna.Once arrived to the railway station, buy a map and stroll in the marvellous calle( Venice streets are called " calle"). You shouldn't miss a visit to St. Mark's square, it will take maybe a whole day 's queue, but you should visit also St. Mark's church. If you are interested in art, you can visit: Palazzo Grassi, Guggheneim Foundation and " La biennale"! It will be worthy paying visits to the churches spread out in the city centre too. I won't even miss out Venice cemetery.
Verona: the first thing that cames into my mind is : Juliet's balcony! There's a tradition about it: you could leave a love letter asking to Juliet for love protection! Don't forget rubbing Juliet's breast! You'll find " Juliet's balcony in a courtyard, where there's Juliet's statue: people are used to rubbing Juliet's breast invoking love luck!
Genova: if you mean Genova in Italy, you should visit the Aquarium.
I've never been to Cinque Terre or Budapest and I shortly visited both Cannes and Nice( I would say not to miss the promenade near the seaside and their day markets ) so I can't give you so much help on it.
Last thing: try to taste all the typical food in Genova, Venice, Verona, Cinque Terre.
And have a nice holiday!
I'm glad you're back because I was a little worried, with the events in Nice
i'm back to my home now. By the way I visited Geneva, Switzerland and not Genova, Italy) But never mind, I really enjoyed the trip. Thanks you all very much for your advice!)))
Is it an arranged tour so you are accompanied by professional guide?
BTW, I'm a bit confused, are you sure you are going to visit Geneva, with is in Switzerland and not Genova which is in Italy and just next to Cinque Terre?
Having only one day in each place there is not much to do other then having a general tour, may be hop-on-hop-off bus tour which you can find almost everywhere, excluding Venice and Cinque Terre. And when you say Cinque terre it means 5 different small villages. I spent one day in Corniglia and I wish I stayed more.