Home » Videos 2013 Holiday Valley Mudslide Update! View the update video promoting the 2013 Mudslide at Holiday Valley as Gwen goes through what is to come for the annual Mudslide obstacle race at Holiday Valley Resort! Tagged in Summer Adventure Ellicottville Great Valley Login to post comments Email this page Travel Guide It's a full 56-page comprehensive guide, highlighting the activities and attractions in our County and it's FREE!! View the visitor's guide online or request that the Enchanted Mountains guide be snail mailed to you for FREE! Related Events Musical Tribute to Buddy Holly- That'll Be the Day @ The Seneca Allegany Resort and Casino Musical Tribute to Buddy Holly- That'll Be the Day @ The Seneca Allegany Resort and Casino Musical Tribute to Buddy Holly- That'll Be the Day @ The Seneca Allegany Resort and Casino Cash and Cline- Together Again @ The Seneca Allegany Resort and Casino Cash and Cline- Together Again @ The Seneca Allegany Resort and Casino