Summertime at Perlan you will find 1600 sqm of inflatable adventure park! Stóra Skrímsli is probably the largest bouncy castle in the world. We have been a couple of times now and it hasn't failed to exhaust the kids and put smiles on faces all around. Adults are not allowed in on the fun unfortunately. There is a smaller section for 1-6 year olds where you can keep an eye on them. It's hard to keep tabs on them in the larger section.
2020 it is open every day between 12PM and 6PM if the weather allows (last tickets sold at 5PM). It is closed in rainy and windy conditions. You can only get tickets at the venue
Check their facebook group for opening info and you can also contact them via messenger.