If you're not quite feeling a day-long romp around Medvednica, consider taking a detour to Maksimir Park. No one will mistake this 780 acre green space to the northeast of the city for an adventure-hub, but if you're interested in strolling/biking through some scenic Zagreb real estate you could definitely do a lot worse. 5 lakes, tree-lined paths, forests, even a small zoo (yippee) make Maksimir extremely popular during summer weekends, so you may have to share your workout space with a crowd. Still, for the thrill of saying you've visited Zagreb's oldest public park (little sarcasm there), it's definitely worth an afternoon or two (no sarcasm there). Enjoy.