Towering sand dunes give this federally protected area its name, but they’re only one reason to spend a few days along the Lake Michigan shore. Marshes draw migrating birds, and 16 miles of hiking trails weave through woods and across sand. What we love: Spotless campsites (including 136 RV sites); a nature center with hands-on areas for kids; and clean, newer, spacious bathrooms. From $26, a huge value just 45 miles east of downtown Chicago. See Midwest Living’sreview. (866) 622-6746; in.gov/dnr