Rushing River Battle (encounter idea)
Here's one for you Dm's that want to have a battle where the players are on the river. The players are having to travel via a small boat/raft down a river, to get to there next destination. As they are doing this the speed of the river starts to increases, till it gets to a rapid pace. After awhile of this, the party will see that in front of them appears to be some Sahuagins. The Sahuagins ready there weapons as the party's raft approaches. Soon enough a battle between them & the players will begin.