Dela Peña fired 17 points including seven in the fourth quarter that sealed the Snack Masters second win against the same number of losses.
It was a fitting gift to Granny Goose coach Robert Sison, who turned 39 yesterday.
Dela Peñas triple early in the final period gave Granny Goose a 63-50 lead but Hapee closed the gap at 74-71 on a run sparked by Gabby Espinas.
Granny Goose shut down Hapee-PCU the rest of the way, dealing the Lamoiyan-owned franchise a third setback against a win.
Heroes Cup champion Magnolia Ice Cream drubbed Harbour Centre, 63-57, also for its second win in four games later in the day.
Fil-Am Kelly Williams exploded for 11 of his 23 points in the fourth quarter and added 16 rebounds to lead the Spinners past the struggling Harbour Centre side.
The high-leaping Williams strung up five straight points in a 7-0 blitz the Spinners unleashed to break the back of the Port Masters at endgame.
Harbour Centre remained winless in four matches.