spoiler:

If you look around you will see a little stone that shines. Go over and click it, and you are able to explore an area where you will find Radiant Pearl 2.

spoiler:

When hovering the mouse cursor over a mysterious stone after entering the secret passage way:
It appears to be very old. You can make out some faint symbols on it.. who knows what it means.

When you find the Radiant Pearl 2:
In the hidden crevice
As the rocks roll away, a shimmering light catches your eye. The glowing sphere is too pretty to ignore, so you tuck it away into your pack. It's in your temp inventory.

quote:

Unlocked Chests:

Chest 1:
As you expected, the chests are empty except for a bit of dirt and a bug or two.

Chest 2:
Sifting through the dust and dirt at the bottom of the empty chests, you find a small piece of paper. It reads -
Arr! 'pon diggin' this hole, me crew noticed that this cave seemed like it had been used before.. Well,
whoever was here before best not be comin' back n'
stealin' me treasure or there will be heck to pay!