In Maribor, Slovenia, there are many interesting things to do that cater to various interests such as history, nature, architecture, and wine culture. Here are some top recommendations:

• Explore Maribor Castle and the Maribor Regional Museum located in the castle, which showcases the archaeological and cultural history of the region.
• Wander around Grajski Trg, one of the main squares where you can see the 15th-century castle and the statue of St. Florian from the 18th century.
• Visit the Maribor Cathedral and climb its bell tower for panoramic views of the city.
• Experience the oldest vine in the world, which is over 400 years old, located in the Lent district.
• Take guided tours and wine tastings in the Vinag Wine Cellar, which is part of an extensive underground wine cellar network below the city.
• Enjoy the picturesque Mestni Park with its ponds, aquarium, and terrarium.
• Visit the Museum of National Liberation for historical insights into the region's 20th-century past.
• Walk along the Drava River, and consider a boat ride for scenic views of Maribor.
• Hike up Piramida Hill for beautiful views and historical castle ruins.
• Discover the city's unique blend of Gothic, Baroque, and brutalist architecture.
• Enjoy cultural events and performances at Narodni dom Maribor.
• Check out the Maribor Synagogue, one of Europe's oldest synagogues, which now serves as a cultural center and museum.
• If visiting in winter or interested in outdoor activities, explore Mariborsko Pohorje, a nearby area with slopes for skiing, hiking, and biking trails.

These activities will give you a good mix of culture, nature, history, and relaxation to enjoy in Maribor. If you want specific addresses, timings, or details for any of these, I can provide further information.