One of the most clever things you can do on a sunny day in Wrocław is prepare a picnic, head here, and rent yourself a kayak (2-person 15zł/hr, 3-person family kayak 19zł/hr), rowing boat (25zł/hr) or motorboat (80zł/hr). They also operate four water trams through the tiny canals of the Old Town. These run from 12:00 - 20:00 weekdays and 10:00 - 20:00 weekends between Zatoka Gondoli, Wyspa Słodowa and the Zoo, leaving whenever clients are found; tickets cost 15zł for 30min trips, 25zł for 55min trips. If you're after some true stag party swag, rent their ARKA passenger ferry - complete with on-deck restaurant - for 400zł/hr (12-14 people max). Rentals and cruises available until the end of October.