Claim rather difficult, here the funpark user's self-responsibility usually predominates.
Anyone using a recognisably dangerous special facility without respecting the park rules (start small and work up, inspect the element before the jump) carries the responsibility largely themselves under OGH 3 Ob 237/24k. The operator meets his duty when difficulty grade and conduct rules are clearly signposted and the facility is spatially demarcated.
Pursuing a claim against the slope operator is rarely promising in this constellation. It makes sense to check your own accident insurance. For minor users, however, a closer look at supervisory duties is worthwhile, for instance in the context of a school ski course.