I'm planning a trip to Palermo and came across the Hop On Hop Off Palermo (https://www.hop-on-hop-off-bus-tours.com/tour-city-sightseeing-palermo-hop-on-hop-off-bus-tour) buses. They seem like a convenient way to explore the city without worrying about directions, especially for first-time visitors. But I'm wondering if they're actually worth the cost. Do these Palermo bus tours cover all the major attractions like Palermo Cathedral, Teatro Massimo, and the historic markets? Also, how frequent are the buses, and do they get crowded during peak tourist season? I'd love to hear honest opinions from people who've tried it—did it make sightseeing easier, or would you recommend exploring Palermo by walking or using local transport instead?