Attach your skis to your backpack on the beach (don't forget a tent and food) and hike up for about a week until you find some snow around 5000m. Be aware that you will walk through jungle for a long time (a machete comes in handy) and that the indigenous population might not want you there. After all, the mountain is of some spiritual importance to them.

Skin-up once you reach the glaciated and heavily crevassed terrain. There are a number of short (first) descends possible that will blow your mind. Consider spending a few days on the foot of the glacier.

Once you are done, pack up again and relax on the nearby beaches after hiking down for 3-4 days.