We are planning an RV Trip in Europe for two weeks with our 12 year old twins this July. My son doesn't really like going to too many museums but like doing outdoor activities (hiking, biking, kayaking, etc). We will start from Frankfurt. We have to go to Paris (for our daughter) and Lodi (a city near Milan to meet someone) but we are not sure if we'll have time to go down to Rome. We want to go to the Alps definitely. Could you give us some idea where would be good to visit? Where should be part when we go to the big city (Paris, Rome, Venice etc)?