8. Indoor activities

If it is raining cats and dogs and you still need some activity, it can be a good idea to go bowling. The main bowling place is in Oskjuhlið (Öskjuhlíð), close to the Pearl (Perlan). Check their home-page.
There are also many museums in Reykjavik and surroundings. One of them is the Saga Museum in the Pearl which my kids grade number one, and also for example The National Museum of Icealand close to the University of Iceland.
Or, of course, go swimming ...