Mont Blanc
Yes, Fontainebleau also has it's very own Mont Blanc. Not a big mountain at all, but such a beautiful small remote area. Just a 5 minute hike further from Elephant but most probably no people around. It features some really nice classics and maybe future hard lines. For developers there would be a good amount of easier very good looking problems to brush and climb, maybe you want to add your name to Fontainebleau as well? :)

There are some really good boulder problems in this area, mostly in the 7th grade range, why not try them all!

The reception is surprisingly good in the area, but it might still be good to download the guide for offline use.
Hope you'll enjoy the area :)