When my friends and I were checking on the different things we can do in Sagada, the tourism office and my friend's guidebook suggested spelunking.
A great place to do spelunking is the Sumaguing Cave. All of us were first time spelunkers and we hired a tour guide for this activity. It was a good decision too, since a tour guide showed us the different rock formations of the cave, and he gave us tips on how to explore the caves the safest way possible.
It is also recommended to bring your own headlamp, so that you can see your way in the cave in case you trail behind your group - the tour guide with the torch lamp usually is in the front of the group, obviously.
Wear clothes you don't mind getting wet and dirty in (even wear a swimsuit underneath because there are parts of the cave that you can take a quick dip in). It is also important to wear no-slip shoes (no flip-flops, there's a big chance it won't survive) and have waterproof gears and bags.
There will also be times in which you have to hold on to rocks for balance, and yes, some rocks may be slimy (because of bat poo) or muddy.
Another important thing is when you and your friends decide to do this activity, give it at least half a day's time for it. This is for you to really enjoy looking at different rock formations and have a quick dip in the mini pools in the cave. Check with the tourism office for the best time/schedule to visit the caves.
Visiting Sumaguing cave is a fun experience and something that even locals have to do even once in their life especially when in Sagada.
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