Krupajsko Vrelo, a stunning natural karst spring near Žagubica, is a beautiful turquoise-water destination best accessed by car due to its remote location; public transport is generally not an option for the final leg. It is ideal for solo visits, offering easily navigable paths to the main viewing areas, although a guide might be included in broader regional tours. The optimal time to visit is during spring, summer, or early autumn for the best weather and vibrant colors, as winter access can be challenging. The approximate cost is low, as entry is typically free, with any expenses mainly going towards transportation and local food; a typical visit lasts 1-2 hours to explore the spring, its waterfall, and the picturesque surroundings. Visitors should note the incredibly clear, cold water and look out for local eateries serving traditional Serbian cuisine, especially trout.