The 7d is perfect for pictures and videos. I'll just go with one lens that is between 35-50 focal range. Go as light as possible.
On my last vacation to Europe, I was lugging around a 5D along with 3 heavy lenses and a flash all the time. Between that and chasing around my 4 year old in London, Paris, Lyon, Aix en Provence, Nice and Monaco, needless to say my back muscles got stronger in the most unpleasant way.