Make sure you bring enough memory for all the photos you will want to take here. The amazing scenery of the lakes will simply want you to hit the shooter again and again.
Some plastic wrap is also good to take if you are visiting in months with lots of rain because some waterfalls create lots of water moist and you may want to protect your camera from getting wet.
There are many many opportunities for great photos here, just don't make the mistake I made in coming with only 5 shots left!
Miscellaneous: Bring plenty of water, lots of walking is involved if you want to explore the park extensively and you WILL get tired.
comfortable shoes for hiking, if you are going there during the summer season take also with you a cap and cream to prevent sun burns
Photo Equipment: you need a camera of course to capture this beautiful place
Miscellaneous: Plenty of drinking wather