The area has since been an ecotourism destination in the Philippines offering serene panoramas, various outdoor activities, such as trekking and biking, as well as numerous food choices with its line-up of dining places and food stalls. It prevails as a go-to vacation spot for nature lovers as it is only two (2) hours away from the Metro (O, 2014; GMA News Online, 2008). Additionally, the lake offers livelihood programs to the locals by means of aquaculture, or the production of seafood grown to market size (National Oceanic and Atmospheric Administration, n.d.). Both legal and illegal construction of fish pens for the breeding, rearing, and harvesting of aquatic fauna for exploitation by the locals, is supported by the lake. All these activities pose imminent threat to the sustainable management of the lakes' ecosystem, thereby its stakeholders. Byron and Costa-Pierce (2013) already noted the “boom and bust” cycles of cage aquaculture that resulted from the poorly planned and regulated expanded cage culture in the Seven Lakes of San Pablo. Environmental degradation, overuse of surface water resources, and changes in the hydrologic regimes in enclosed waters due to the unchecked proliferation of aquaculture structures are looming (Eng, C. et.al., 1999). In the long run, aquaculture will also have to increase its production capacity in order to ensure sufficient animal protein supply for the growing population (Ross, L. et.al., 2010). While the developing tourism in the area caters to its economic and financial needs, the Lakes' integrity is compromised. The rapid and high concentration of tourist activities renders the lake vulnerable to improper waste disposal, noise and air pollution, and overall ecosystem degradation (United Nations Environment Programme, 2001). There arises the need to harmonize the sustainability of aquaculture-based food production with the increasing density of cultivated areas. The fundamentals of classic sustainable development require that the maximum use of the ecosystem does not incur damage to its regenerative capacity (Monte-Luna, P. et al., 2004). As this density-dependent ecosystem offer a finite resource base competing with other industries, its carrying capacity, specifically the maximum number of aquaculture structures and recreational infrastructures the ecosystem can support, must be estimated.