Enjoy Resort Amenities Near The Quad Cities in Hillsdale, Illinois. Situated in the heart of the Midwest, Sun Retreats Rock River, formerly known as Sunset Lakes Resort, provides a premiere camping experience in Hillsdale, Illinois. At this award-winning resort, campers can set up their RV on our new seasonal sites with concrete pads and patios. You can also stay in one of our fully furnished two-bedroom vacation cottages. Cool off in our huge outdoor swimming pool, or stay active with outdoor recreations like gem mining, basketball, horseshoes, tennis, and our rolle bolle court. Our pet-friendly campground also features a dog park for your four-legged family members. You'll find exciting attractions in The Quad Cities including riverboat cruises along the Mississippi River, just 15 minutes away.