After spending 8 days on a London tour in June, three of us will extend our stay by 5-6 days. We will travel to Brugge, Belgium to visit family for about 3 days and have also been invited to visit friends one hour from Frankfurt (Braunfels). I need to choose our return airport and don't know if we are trying to do too much. We can either depart from Brussels or Frankfurt. I don't want to spend all of our time traveling but would like to show my niece and sister a little of Germany. Any advice would be appreciated. Thanks!!