We came across one hoggorm - Vipera berus, the one poisonous viper we have in this country - which was attempting to bask in such sun as there was that day.
She was a female and one of the guys, P, who knows a lot about the native Norwegian snakes, palpated her for eggs, which it turned out she was in fact carrying. Cool. :-)
She wasn't too thrilled to have us there and did her best to to chase us off.
We also saw a stålorm - Anguis fragilis - which is not a snake, but a legless lizard. But I didn't get any pictures of that which were good enough to post here, to be honest. (It wasn't a very impressive specimen anyway. ;-)
... one of our esteemed members had had the foresight to bring another snake with him! LOL! He had caught it in his neighborhood earlier and brought it with him (in a sock!) to release it during the excursion. Just because. :-)
This was a buorm - Natrix natrix - an entirely harmless and very pretty snake. A juvenile specimen.