Dispatch 12 Befouled Water Elementals at Mystral Lake, due east of the Talondeep Path and southwest of Splintertree Post. Scout the gazebo on Mystral Lake that overlooks the nearby Alliance outpost. Return to Mastok Wrilehiss at Splintertree Post, Ashenvale.
If you want to be useful, then why don't you do something about the situation near Talondeep Path?
The transports between Ashenvale and Stonetalon are at a standstill because of the lake coming alive and attacking anything that gets close... which means anyone on the path. What'd be even more useful than just putting the hammer down on the water elementals there is someone scouting the gazebo on Mystral Lake - the one that has a solid view of the Alliance outpost there.
You up for being useful?