How can you prescribe or protect its beauty of st. paul subterranean river

Question

How can you prescribe or protect its beauty of st. paul subterranean river

Answer 1

by keping it clean, no throwing of trash anywhere, no vandals, the number of tourists should be regulated...

Answer 2

1.  keep surrounding areas pristine. do not allow commercialization

2.  littering should be a criminal offense

3.  limit number of visitors/avoid over crowding

coz of its outstanding universal value, this river in puerto princesa is just one of 5 "properties" in the philippines that have made it to the world heritage list in 1999.  the others are the Baroque Churches of the Philippines (1993) Tubbataha Reef Marine Park (1993) Rice Terraces of the Philippine Cordilleras (1995) and Historic Town of Vigan (1999)