'Bisous' in French means 'kisses' and on their national day (especially in Paris) you may get a few, since everyone is celebrating.
It's a real treat to be anywhere on July 14th in France, but Paris knows how to put on a show. After the sun goes down (assuming there's no strike), the sky above Trocadero Palace, behind the Eiffel Tower, will light up in the colors of the world's second largest annual fireworks display (behind New Year's in Sydney).
I'd suggest shopping for picnic goods early in the day and then heading over to the Champ de Mars, the grassy lawn area between the Eiffel Tower and the Ecole Militaire. Secure your space and watch the sun go down. Once it's dark, the festivities will begin and you'll fall for France all over again.
Just so that you know your history while celebrating, Bastille Day commemorates the 1790 Fête de la Fédération that was held on the first anniversary of the storming of the Bastille on 14 July 1789. This take of action by the people of Paris, sparked the French Revolution (yes, one of several to come).
If you're up early the morning of the 14th, head towards the Champs Elysees where the oldest and largest regular military parade in Europe is held, in front of the President of the Republic, French officials and foreign guests. The military parade and the fly-overs are wonderful to witness.