Very Rough Itinerary (Still have 2 years to plan!)

[stephanx]

Hey Guys! I am planning on Backpacking Europe after High school with a buddy. I am currently in 10th grade so i still have about two years to plan!
This is my itinerary. The cities in parentheses are places i'm considering to stay in or make a day trip to. I definitely have to narrow this down. I only have about two months to do the trip cuz then college will start!
Please give me you opinions/Recommendations

Itinerary

England: London [5 Days], (Bath)
Spain: Madrid [4 Days], Barcelona [4 Days], Valencia [3 Days], Seville [3 Days], (Toledo)
France: Paris, [5 Days], Marseilles [2 Days], Nice [2 Days], (Cannes)
Italy: Rome [5 Days], Venice [2 Days], Florence [3 Days], Naples [2 Days], Cinque Terra [2 Days] (Milan), (Pisa), (Pompeii)
Belgium: Brussels, [4 days] (Ghent), (Antwerp), (Bruge)
Netherlands: Amsterdam [4 Days]
Germany: Berlin [ 4 Days], (Rottenberg)
Portugal: Lisbon [4 Days]
Switzerland: Zurich [2 Days], Interlaken [3 Days], (Grindelwald), (Zermatt), (Lucerne)
Austria: Vienna [3 Days]
Denmark: Copenhagen [3 Days], (Sweden)
Czech Republic: Prague [3 Days]
Ireland: Dublin [3 Days]
()=Day Trip or possible place to stay

80 euros a day