Okay , Currently I consider to make itinerary
Amsterdam 1 days ( I dont really into it , so I consider to only take a snap on some windmill ) , overnight bus to colmar about 40€
Colmar 1 1/2 days , colmar to interlaken . Train fare about 50 €
Switzerland 3 days , bern to paris overnight bus 30 €
Paris 2 days , fly to reykjavik about 60 € (promo fare)
Iceland 5 days , fly to amsterdam about 65 € (promo fare)
I'm gonna stay in hostel with average fare 20-30 € , already find cheap hostel in reykjavik . If there is something wrong , would you mind to tell me what it is ? .As you can see I only use overnight bus two time , so it's not that bad . I've experience that much worse than this , Bangkok-Phuket and Tokyo-Osaka , everything is well maintained , and I still enjoy my day trip ...