The PARC DE LA LUNE is in the northeast corner of the district. The entrance is on the north side, opposite St. Aicard's Church. (map) Enter through the gate below the "Métropolitain" sign.
Bernard is feeding the pigeons...or drinking...or something. There is also a gated entrance to the abandoned Métro tunnels that doesn't open from this side. (See the ABANDONED MÉTRO TUNNELS section of the PARISIAN GHETTO walkthrough for more info.) Save the game before speaking to Bernard.
Dialogue - Bernard the Janitor: Choose the more polite dialogue options ("Your name's Bernard...," "I'm trying to find someone," and, "Here, now how do I find Bouchard?"), otherwise Bernard will take your money and still refuse to help you. Agree to find Bernard's trinket box inside the Serpent Rouge—and pay him €160—and he will help you get to Bouchard. If you don't have enough money, if you have already agreed to help Pierre, or if you have not yet spoken to Janice, then Bernard won't talk to you. You can pick up cash on the street or sell items at Rennes' Pawnshop to get more money, but once you've made an agreement with Pierre, you can't deal with Bernard.
After this conversation, your notebook is updated (28/62): "Retrieve the 'Box' at Serpent Rouge. In broken lighting rig." Also, you now have the EX-JANITOR'S KEY (11) in your inventory. (One of 4 pickups on this map, 11th in the level.) Examine the district map (one of three for the "Cartophile" achievement/trophy). Then leave the park the way you came in.
NOTE: If you do alienate Bernard, you can still deal with Pierre. To find him, exit the park, turn left, and follow the Rue Dominique all the way to the end (screenshot), where you'll find the CAFÉ MÉTRO. The guide for Pierre's Errand will take you from there.
To proceed with Bernard's errand, turn right onto the Rue de Piolet. Go down the hill. (The next map loads on the way.)
At the bottom of the hill, where the truck blocks the road, turn right onto the Cours de la Seine.
You'll find the nightclub's garage entrance just ahead on the left. (You can see Janice in the distance.) Enter using Bernard's key. Follow the SERPENT ROUGE - BERNARD walkthrough to find the TRINKET BOX.
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