Last time I went - about 14 years ago - the theme park was starting to look a bit tatty, with paving slabs lifting, odd bits of cracked masonry. I'm sure they've done it up since.
as an adult visiting Mauschwitz I enjoyed seeing how they'd designed clever perspectives to make streets look interesting.I'm not much of a one for rides but they all seemed slickly done.
Cost of coffee / food was sky high, and all cafes and restaurants were very crowded (it was Easter). Take a large thermos and some corned beef and onion sandwiches to see you through.