Puddin, it looks like we have two Roadblock-looking activities:
1) Book delivery at Vilnius University (Ron and Nik shown solo running)
2) Stilt walking at the rummi place (Ron on stilts, Christina on foot)
I guess if I had to choose I would pick the stilts as looking the most likely.
I think that the two DETOUR choices would be:
MOUNT: -- Get up on stilts and walk the path, or
COUNT: -- Count the number of fence posts.
For the first we have Ron and Christina, for the second we see the Blondes in front of a rustic fence and Jennifer is holding the Gnome. Does this mean that they get the gnome after the fence counting or that they have won it or found it before the Detour?
Nicholas seems to be doing the ROADBLOCK. Perhaps finding a number of books in the University Library. But the odd thing is that in the first shots of him in the courtyard he is carrying a basket which he no longer has later on. Curious.