The lake is surrounded by numerous green spaces and trees, which makes it the largest recreational area in the city of Münster.

At the same time, Landois wanted to guarantee the city's drinking water supply with the reservoir, enable sports activities such as rowing, sailing and swimming.

[3] In spring 1914, a quarter of a century after Landois´ explanations and nine years after his death, Italian workers started to implement his visions to reduce the risk of flooding for the city of Münster.

[4] These plans were discarded after the end of the war and, instead, in 1972 to 1976 the lake south of the Torminbridge was expanded by 19.5 hectares (48 acres) to almost double the size, as part of the construction work for the Münster Allwetterzoo.

The intention was to enable the continuity of the Aasee weir for aquatic organisms in accordance with the requirements of the Water Framework Directive.

Due to limited space available in the inner city, the so-called "slotted pass construction" was chosen for this fish ladder.

On April 12 and 13, 2013, for the third time a ranking regatta of the Paralympic one-man keelboat class 2.4mR was held on Lake Aasee.

In autumn, the Pirates' Aasee Cup, organized by the Münster Sailing Club, takes place on the part of the lake nearest to the city.

On the upper Aasee, the part of the lake farther away from the city center, the pirate regatta "Bockwurst Challenge", the "Laser Cup" for all laser classes and the optimist "Kiepenkerlregatta" are held every year as ranking list regattas by the "Hansa Münster" sailing club.

Especially on May 1 (Mayday holiday) the Aasee draws crowds of guests who visit the local recreation area for a barbecue.

After May 1, 2013, employees of the waste management company of Münster collected six tons of trash from the park area around Lake Aasee.

Classical concerts with international cast known as "AaSeerenaden" have also been performed on the Aasee Terraces since 2010 and end always with a fireworks[13] display.

A musical program ranging from "jazz to classical, orchestra to choir, pop to baroque"[14] is regularly performed.

[15] The "Waterbus Professor Landois", which was named after Hermann Landois, the founder of the zoo in Münster, was built from mahagony on oak in a shipyard on Dümmersee (lake Dümmer) in 1974 based on the model of a Dutch canal boat with a length of 17 meters and a width of 4.50 meters.

[32][33] Swimming and surfing in Lake Aasee are currently not recommended and even prohibited due to the poor water quality, especially in the hot summer months.

The main problems are the blue-green algae, which are multiplying in large numbers due to over-fertilization, but also E. coli bacteria.

The Hygiene Institute of the Westfälische Wilhelms-Universität Münster has meanwhile reduced the number of blue-green algae in particular with the help of appropriate chemicals to remove nutrients from the lake.

Without extreme structural interventions such as deep-water drainage or heavy dredging, it will not be possible to permanently eliminate the sapropel that has been created as a negative side effect of the long period of anaerobic conditions.

Without extreme structural interventions such as the deep-water drainage method or heavy dredging, it will not be possible to permanently eliminate the sapropel that has been created as a negative factor by the long period of anaerobic conditions.

[34] The water quality of Lake Aasee will be improved by the exchange of microbes, which has not been possible for 90 years due to the weir on the street Badestraße.

[39] In addition, the creation of a body of standing water is intended to lower the temperature of the inflow into the Aasee by a few degrees to reduce the growth of blue-green algae.