Parks that come to mind right now:
Austria: Mayrhofen, nice set up for different level riders and good vibe, no halfpipe though. Bene Mayr for example used to ride here a lot. Other good parks in Austria the ones in Solden, Horsefethere Superpark at the Dachstein glacier, Novapark @ Silvretta Montafon.
France: Les Deux Alpes, big park with two pipes, different level lines but pretty busy during summer though. Val Thorens has improved a lot over the last few years but I haven't been there this winter so can't really say. Tignes also has a pretty good park, they also hosted the European X-Games edition.
Switserland: Davos, different parks spread over the resort, well maintained, good pipe, nice terrain to build things yourself. Other parks: Laax off course,
Italy: Alta Badia, Kronplatz, Livigno and Val Senales (Schnallstal).