Take the kids to Bengawan Solo and spend a quiet afternoon strolling along the water's edge. There's something about being near a river that makes you feel calm and peaceful.
You'll soon find out why this Central Java flowing body of water is popular with travelers. If you're searching for other things to keep you busy, Solo Paragon Lifestyle Mall, Muhammadiyah University of Surakarta, and Mangkunegaran Palace are in the area too. They won't take you long to get to from Bengawan Solo.