The thatch roofs aren't super common throughout Denmark, but I'd say about a fifth of the homes we saw had them, more so in the countryside or tourist towns. Apparently they are made by using a giant curved needle to loop the thatch together. From there, the main part of the roof has to be replaced every ten years and the top part every two years. If moss grows on the thatch, it just gets left until it is time to re-do the thatch.
On Whit Sunday, we joined the extended family for a picnic in the park. While there, we played "Viking" a common game that involves tossing small blocks of wood at slightly bigger blocks and that we saw folks playing all across Copenhagen. Gathering the family for a big picnic in the forest is apparently quite common, and even the deer in the forest didn't seem too fazed by the families. This is Greg by the Dumbo ride in the amusement park attached to where the picnic was held.
Lastly, what retirement should be like. Sorry we wore out Per, but I greatly enjoyed Copenhagen!