You need to gather the lilies from around the tree in game

Chapter 9: Lilies For the River Daughter - At first Tom is not too interested in helping you locate the evil birds. Eventually he gives in but wants you Mabinogi Gold to do something for him first. 

Tom asks you to gather some lilies from the river down by Old Man Willow. Head south from Tom's location into the river. 

Follow the river west and you will run right into a giant tree called "Old Man Willow". You need to gather the lilies from around the tree. 

When I was there the tree sucked all of my power, but not my morale. After you have what you need return to Tom by heading east in the river and then up the hill near his house. Reward: 1s 80c

Option two is easier, but if you don't already have a fellowship it's somewhat pointless. When you finish talking with Tom go up near his house. 

On the North side of the house is a path heading north. Follow that path (it's called the Old Barrows Road). It will hook and weave but eventually lead you into the North Barrow Downs (much faster than option one).