A construction method for creating a tropical style swimming lagoon with a sloped access at an infield site of a race or activity circuit facility, the infield site being contained within a race or activity circuit perimeter, the method comprising: a) Demolishing at least part of the infield site, wherein the demolition process includes excavating a layer of between 15 cm to 6 meters, the excavated material having a volume of at least 4,000 m3; b) forming a basin for a large water body having a surface area of at least 3,000 m2 and a minimum depth of at least 1.4 meters at its deepest point, wherein earthworks for the basin are created within the infield site surrounding perimeter, and wherein the basin includes a basin perimeter and a bottom; c) constructing water containment walls on at least one section of the basin perimeter to form a waterfront perimeter, and covering the bottom of the basin with a non-permeable material, wherein the shape of the waterfront perimeter is curved and the basin has a maximum width of 300 meters; d) constructing a sloped access area on at least one section of the basin perimeter to form a beach access into the large water body; wherein the sloped access area is constructed with a support slab to provide structural stability to such area; e) constructing one or more barriers around the basin perimeter to cordon off an area to establish a controlled access area, wherein the controlled access area includes a beach access perimeter, and the barriers include at least one access point to selectively allow users into the controlled access area, whereby the users allowed entry into the controlled access area are able to use the beach access; f) Constructing at least one additional recreational facility comprising food and beverage and commercial facilities selected from the group comprising restaurants, bars, kiosks, stores, cafes among others in the vicinity of the waterfront perimeter; g) providing a connection path that connects the outfield of the racing and/or activity circuit with the infield site, in order to allow transit of vehicles and/or people from the outfield to the infield. a) Demolishing at least part of the infield site, wherein the demolition process includes excavating a layer of between 15 cm to 6 meters, the excavated material having a volume of at least 4,000 m3; b) forming a basin for a large water body having a surface area of at least 3,000 m2 and a minimum depth of at least 1.4 meters at its deepest point, wherein earthworks for the basin are created within the infield site surrounding perimeter, and wherein the basin includes a basin perimeter and a bottom; c) constructing water containment walls on at least one section of the basin perimeter to form a waterfront perimeter, and covering the bottom of the basin with a non-permeable material, wherein the shape of the waterfront perimeter is curved and the basin has a maximum width of 300 meters; d) constructing a sloped access area on at least one section of the basin perimeter to form a beach access into the large water body; wherein the sloped access area is constructed with a support slab to provide structural stability to such area; e) constructing one or more barriers around the basin perimeter to cordon off an area to establish a controlled access area, wherein the controlled access area includes a beach access perimeter, and the barriers include at least one access point to selectively allow users into the controlled access area, whereby the users allowed entry into the controlled access area are able to use the beach access; f) Constructing at least one additional recreational facility comprising food and beverage and commercial facilities selected from the group comprising restaurants, bars, kiosks, stores, cafes among others in the vicinity of the waterfront perimeter; g) providing a connection path that connects the outfield of the racing and/or activity circuit with the infield site, in order to allow transit of vehicles and/or people from the outfield to the infield.