Europe calling

For many years now I have harbored a desire to go backpacking in Europe. Looks like this summer it will finally happen. 4 long blissful weeks :)
Here is the current draft of the itinerary. Suggestions are welcome. And if you can join in on any leg of the tour, you are even more welcome!

Jul 12 (Mon): Arrival in Frankfurt early morning, evening flight to Madrid
Jul 13: Day in Madrid, evening train to San Sebastian
Jul 14 - 15: San Sebastian beaches etc, maybe day trip to Pamplona to catch the festival of the Running Bulls
Jul 16: Evening train to Barcelona
Jul 17-19: Barcelona, Overnight train to Seville on 19th
Jul 20-21: Seville, maybe Granada or Malaga
Jul 22: Flight to Milan, evening train to Florence
Jul 23: Florence
Jul 24-25: Cinque Terre - a set of 5 villages built on the Northern Italian coast. Great for hiking
Jul 26 -27: Rome, Vatican
Jul 28-29: Naples and maybe day trip to Pompei, evening flight to Nice on 29th
Jul 30-31: Nice, perhaps Monaco
Aug 1: Train to Paris, evening in Paris
Aug 2-4: Amsterdam. Train from Paris on Aug 2 morning. Departure to Berlin on Aug 4 evening
Aug 5: Berlin
Aug 6: Prague
Aug 7: Back to Frankfurt
Aug 8: Flight to Mumbai

Essentially 9 days in Spain, 8 days in Italy and another 9 days scattered around Nice, Amsterdam, Berlin, Prague. One month seems like such a short time!