Learn about ponds at Marenakos Rock Center Join Mark the Pond Guy for a free workshop on water-features, 10 a.m. to 3 p.m. Friday, May 15 at Marenakos Rock Center in Issaquah. May 12, 2015 7:53 pm Join Mark the Pond Guy for a free workshop on water-features, 10 a.m. to 3 p.m. Friday, May 15 at Marenakos Rock Center in Issaquah. Register at www.markthepondguy.com/events/2015/5/4/interactive-workshop-with-mark-the-pond-guy.