Located between Seattle, WA and Portland, OR and near Mt. Rainer, Mt. St. Helens and Mt. Adams. Harmony Lakeside RV Park is one of the premier destination parks in Washington. The park sits on the shore of Mayfield Lake so bring your RV or rent one of our delux cabin rentals. You are welcome to enjoy the Gardens, Koi Ponds and Artwork located throughout the park. In addition to canoe and boat rentals, a sportsfield, volleyball court and horseshoe pits are available. Put a "little harmony" in your life. Come stay for a day, a week or a season. We look forward to your visit.