The idea is I will to Germany in June and my wife will follow a fortnight later and then do perhaps a multi city tour, e.g. Paris, Rome. Not too much, as I said easy.

Any good tour operators in BKK? Or how would you organize it?

Traveling around Europe is really easy...and can be fun if done by yourself. You have much more freedom to stop and see what you want and to setup your own itinerary. I think finding a tour that matches what you want to do will be tough.

I would perhaps get a guide book for France and Italy. Or Paris and Rome. Inside will be lots of recommendations for hotels and things to see. You can easily be your own tour guide. We did this in Paris 2 years ago and Rome 3 years ago. Great fun.

You can also check with sites like lonelyplanet.com (oriented towards backpackers and younger people), frommers.com or fodors.com. Even tripadvisor.com has good stuff on it.

Have a blast!