Flaine

unfortunately there is NOT a snow park, literally the fucking bane of my life. They stopped building it 2 years back, and when i bought my season pass the next year it was the first year that they stopped building it! I think the contract was up.
Having said that they are trying to build a new trail through the trees in flaine, (similar to le stash in avoriaz). I saw a few really fun looking rails there when i was there in jan but there was not enough snow for them to set it up, hopefully now they have sorted something out. I guess i will see what it is like next week when I'm there, I'm hopeful that it is decent! but if you want a park you should do what i usually do and spend half your time in avoriaz/chamonix then meet your family in samoens.
hope this helps, message me if you need any more info about the resort

Ye don't go to Flaine. Maybe you have a trip booked or something but if you don't, consider hitting up Portes de Soleil, much better all round skiing with sick parks, including the Stash as dude above said.

Been skiing Val D'Isere and Tignes the last few years, bloody great but more expensive than Avoriaz and Portes de Soleil all round. Good luck

yep no park in flaine

on another note got a few snow bunnies friends of mine heading up there in a few days, maybe you'll meet em on the slopes xD