I have to go with the roadblock being to push the candy. In the clip of Terrence and Sarah, he seems to be doing most of the work, shes just taging along with the local. I can see the detour being a "climb up" or "climb down" type of thing.
I wouldn't be surprised if the candy task is one of those Additional Tasks and not the Roadblock OR Detour since it doesn't seem relevant to the net climb nor does it really fit into what a conventional Roadblock tends to be like.
The Detour would, as what North suggested, be probably the climbing down of the net or the climbing up of the stairs, pictured above.
The Roadblock I'm not too sure, and there might or might not even be a Roadblock, given past seasons' (except TAR1 & 12) which have had no Roadblocks.
Anyway, we have one pic of either Marissa or Brooke being rather upset and in tears, kinda, in a boat-ish/beach-ish kinda place. Could that be the RB?