Hi eXtremal,here is some interesting information about where to roller skate in Paris:
The association Mobile en ville organises the famous "Friday Night Fever" every Friday evening (participants meet at 22.00, experienced level)
Meeting place: 40 avenue d'Italie, Paris 13è.
Tel. 01 43 36 89 81
ROLLERS ET COQUILLAGES (roller pour débutant)
A skating tour of Paris every Sunday at 14.30 for beginners
Place Bastille at the Nomades store
37 Bld Bourdon, Paris 4è, Métro Bastille.
Tel. 06 13 24 88 87
All year round: the Mouffetard district (5th arrondissement), the Quais de Valmy and the Quais de Jemmapes around the Saint-Martin canal, between Rue Louis-Blanc and Rue de la Grange-aux-Belles (10th), around the Mairie of the 14th arrondissement (from 14.00 to 18.00), the Quai de la Loire and the Quai de la Marne, along Bassin de la Villette and Canal de l’Ourcq (19th).
Hope it will really help you