As the leader, your retreat is not a vacation. People will say all the time "how was your vacation in Costa Rica." They just dont know how hard this work can be. With the right mindset you can have so much fun, make positive change and fulfill your purpose. But it will never be a vacation. It's legitimate work and if you approach it that way, it can be the most meaningful work of your life. But don't try to also get your vacation in with it.