If you choose Karen as your love, there are a few ground rules. Don't talk to her so much. Make sure you constantly talk to her father and the purple bandana guy. In spring and fall, you can find wild grapes. Give them to her and her father all the time. Visit her in the bar when it is open. Sometimes Karen is on the beach near Ann's house. when the time comes, get the blue feather from Rick and use it on her.