The quest you have is one involving the Tingalf/stolen goods quests. "To Rivertown" is one of the quests that can be left over, or broken, when you get some things out of order. It was my first post on this forum, asking about how to get it out of my quest log.
Click
here for a thread with the correct order of things for the whole stolen goods/tingalf quests. I hope I'm correct in assuming this is your problem and you're not just looking for Rivertown. <img src="/ubbthreads/images/graemlins/cool.gif" alt="" />