Actually close to Seljalandsfoss you will have other 2 small waterfalls, and at the end of the track you will find the best waterfall ever. It is hidden behind the mountain. You can go and walk behind it as well, but you will do it through a river.
we went to National Botanical Garden where we stayed for most of the day. We went because it was a Halloween event which I thought will be fun to try. And I wasn’t wrong at all.