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In summer the snowpark is in Zermatt, on the Swiss side of the Cervino mountain. But of course the park is reachable also from the italian side, Cervinia. For my experience (easy level) the park is full equipped and very nice, but i think it's better to go to the glacier of Les Deux Alpes in France, not only for the park that is amazing but also for the nightlife and for extra activities!
http://www.zermatt.ch/en/page.cfm/vivere_la_natura/sci_e_snowboard/gravity_park?