The renowned architect and city planner Daniel Burnham specifically designed the park for the benefit "of people of moderate means" (Robert Reed, City of Pines: The Origins of Baguio as a Colonial Hill Station). Turning it, or even just portions of it into a parking facility runs directly counter to this vision. Also, constructing an underground parking facility below the football grounds will greatly affect the ecological balance of the area which has already experienced flooding in recent years.  

There are other areas in the vicinity that are better suited for your intentions, such as the current parking lot at the former location of the city library. 

We hereby declare our opposition to your proposal to forever deface one of the city's enduring vestiges of its glorious past.