Buthiers tennis is a small compact area with some classic problems and a world known traverse Coccinelle 7C+/8A. Approach is about 20 seconds, so that should not be an issue. The area is also very family friendly. Because it's somehow still seldom visited some problems have already been re-brushed and some got mossy and forgotten. This is weird, because the area have a bunch of good problems in all grades.
There is only one circuit, the red one, but man, this one has some gems on it, try L'Épaule, L'Éminence Grise and Chien Perdu for example.
For the stronger climbers you can find problems up to 8A and there are several classic routes like Flagrand Desir, La ligne Blanche and Trojan War just to mention a few.