If it's nature you're after, you don't have to go far from the major centre. Greater Poland National Park (PL: Wielkopolski Park Narodowy) is only 15km south of the centre of Poznań and is easily reached by public transport. The park consists of 14,840 hectares of protected land, although a big splash of that is taken up by lakes!  There are 5 marked hiking trails with a combined length of 85 km, with 7 specifically-curated excursion routes that allow you to discover not only the natural but also cultural values ​​of this area as well! Cyclists will be pleased to know that there are about 100 km of roads at your disposal and horse-lovers have 30 km of track (keep it at a trot and it'll last longer!).