If your trip to Boulogne-Billancourt is all sorted out but your itinerary is looking a bit empty, let us give you a few hints and tips.Give that rental car a breather and use those feet. Not far from this neighborhood's center, Parc des Princes is worth a visit. Stade Roland Garros and Jean-Bouin Stadium are a couple of other close-by attractions that draw large numbers of travelers like yourself.