Easy to reach day-hikes in the Italian Appennini and Alpi with public transport?

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I live in Bologna, and I want to go for a day hike or something in the next week or so, however, I don't have a car, and since it is august, most accommodation is booked in the areas of high tourism (Gran Paradiso, i Dolomiti etc). I was wondering if there are any easy to access hikes with just buses and trains etc. Thanks!
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HIKING and TRAVELLING in DOLOMITES ALL YOU NEED TO KNOW | Best trails, weather, public transport
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