Vesipuisto Serena

Serena is a water park in the Lahnus district of Espoo, in southern Finland. It opened in June 1989 and combines indoor and outdoor sections. The complex includes water slides, several pools and children's pools, and sauna departments excavated into the rock. Restaurants and cafes are on site, along with six rental cottages available year-round. In winter the same site operates as a ski centre with slopes and lifts. The water park is operated by Aspro Parks.

Indoor slides include the Tornado, a 50-metre enclosed tube from 12 metres up that spirals riders around a bowl before dropping them through a hole into a pool over 2 metres deep, and the 120-metre Hurrikaani beside its shorter 80-metre sibling, both landing in 1-metre pools. The 159-metre Villivirta rapids ride has strong currents for experienced swimmers. A wave pool sets off waves on the hour, and two whirlpools are kept at +34 °C.

Outdoors, three tower slides named Ahti, Vellamo and Hiisi start from a 10-metre platform, and a 10-metre Half Pipe slide is ridden on rubber rings. The sauna department has separate men's and women's traditional saunas, a steam sauna, and a 10 °C cold-plunge pool reached only via the shower, not directly from the sauna.