Beyond Selidor

Thank you so much for this advice - I've added Seljalandsfoss to the list, and a glacier hike (you're probably the third person who recommended this, so I'm definitely taking notice). Not sure if we'll have time to make it to the north, given we'll be relying on buses and only there for the week, but that coast sounds beautiful! Skogafoss was also recommended to me, and I see that you went there too.

I think it would be good to spend the last day or so back in Reykjavik, where we could visit the Golden Circle as well.

Your post of impressions is super helpful - it's confirmed to me most of the places I want to go, so now it's just a matter of planning our route from place to place (in order to allow minimal time on a bus, and maximum time out and about).