It is open during the summer time and it should be open soon as on their website it says "temporary closed" not closed for the season. Its probably going through Maintenance. But check through the website and it will tell you if its open before you take the trip there.
We were there on Sunday 6th May and it wasn't in operation. I'd recommend you call ahead to check
Yes, it opens for summer.
Thanks! Your answer is awaiting moderation.