HELP!!! Prague, Switzerland, Italy, Spain? LAST MINUTE TRIP

I am a first time solo female traveler. I need some help planning this last minute trip.
This is also my first time travelling alone, anywhere!!

I love walking around, exploring the city on foot, connecting with locals, trying good food, visiting historical sites, monuments, and museums. And most of all, amazing architecture!!

Prague - 3 nights, 4 days.
Day 1 - Arrive and explore
D.2 - Visit the old town, Astronomical clock, charles bridge, the dancing house
D.3 - Prague Castle, Kompa Island, John lennon wall
D.4 - Explore a little more in the morning, then leave for the next destination.

Switzerland - 4 nights, 5 days,
D.4 - Travelling day - Not sure what city to go to, what would be best for DAY 5?
D.5 - Jungfraujoch Train - This is a must, will it take the full day?
D.6 - I would like to do some hiking in the mountains, nothing to rigorous though
D.7 - I would like to spend this time, walking around a city , exploring shops and such
D.8 - Explore in the morning then head out
Please recomend the best cities to stay for each day, I would prefer to stay in just two cities

Italy - 10 days, 9 nights ** As I said i've already seen Florence and Rome
I would like to see Cinque Terre and Venice, and maybe Millan
I'm thinking , Millan for 1 full day, Venice for 2 full days and Cinque Terre for 6 full days


Spain - 10 days, 9 nights
Barcelona for - 5 nights - I want to see all of Gaudi's works!!
I need another relaxed, less touristy city

Asked by Giselle via Travellr.com