[blint63]

There is a hut on the island, accessible through the river, near to the troll. On this island there is a hut with a couple bandits nearby. Is there any quest related to this place or its just there to explore and have some fight?

[Chief.]

Troll trouble is related. If you kill Dimitri, who has killed the bridge-troll's wife, you'll get the bandit hideout key. It will open the door of the hut.
More info at the wiki.

[blint63]

Thanks, I'll replay the game once again for sure, when 2.0 will be released.

[thelazyreader]

While there is no such quest(maybe it was omitted from the final game?) it's worth going to the area with the hut because the hut contains the second-best steel sword in Act 1: the Superb Cutlass. It's for those who didn't craft Jagged Blade or didn't have enough Endrega Fangs.

Though you should go during the daytime because in the night that area is filled with drowners, who are for some reason a lot tougher and harder to kill than in the first game.

[dragonbird]

thelazyreader said:

Though you should go during the daytime because in the night that area is filled with drowners, who are for some reason a lot tougher and harder to kill than in the first game. ›››

That sounds like a good reason for going at night

There are also some fun wraiths at night that jump you unexpectedly.