Ple-Sen
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As I understand it, going through the forest means a battle with elf bandits, and 1200 for each who survives.
The long path simply means 400 for each.
But yes, the forest probably means either an ambush or other unpleasantness. Or maybe both.
Personally, I think the forest is more fun, although riskier, but it's up to you and Arzo. Beleroth, according to the role-playing, has no say.