What to do in Paris (and around) when the weather is nice?

Great, the weather is nice ! Let's take the opportunity to sneak out. The ideas of exits and D'outdoor activities in Paris in the suburbs are many: a walk in scooter or in hoverboard in Paris, a castle tour in Ile-de-France, play the tourists and treat yourself to a cruise-walk on the Seine, organize a picnic at the Bois de Boulogne or the Bois de Vincennes, rent a small electric boat, go to eat an ice cream, watch an outdoor movie (summer) or attend a play in a  green theater…