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Tomasz Rynkiewicz on Unsplash
To be perfectly honest I think a day trip to Venice is enough. It is a beautiful city and an absolute must-do, however, my favorite part about it is the city itself. With the crowds and the prices one day is enough for me. That being said, many rave that when you get out of the center there is plenty to keep you busy for longer.
Trieste lies to the east and fair Verona to the west. Bologna is SW while the beaches and parties are further down the coast in Rimini. Internationally Slovenia and Croatia are easily reached by sea and Ljubljana, Slovenia (farther inland) is a short bus ride away.