This place is aaaaamazing! If you have two days, buy the two day pass. We spent about 5 hours there today and we still didn't see everything. Their current exhibition, Vines & Dragons, is lovely and totally worth the added cost. We spent about 45 minutes in there and really enjoyed the beautiful artwork.
I'm not usually a headphones tour type of person, but definitely get the headphones, which I do not think are an extra cost. Every installation has audio that is only audible via headphones. The audio makes the installations, so def get the headphones.
The cafe is super yummy and worth a stop. There is a coffee shop type of thing in the front, and a cafeteria-style restaurant in the back. The lunches we had from the cafeteria were so so interesting and delicious. We ordered a mix of hot and cold options, and all were great. It was a little pricy, but the food was worth it. There is indoor/outdoor seating available.