We spent about nine hours in the park. Although it won't show in our photos, there are parades of tour groups here, and it's easy to get stuck in the middle of a group. We quickly learned to fall back and let the group move on, then we would have some time to ourselves before the next group came along.
Sadly, the tripod broke within the first hour, we we didn't get the fun waterfall photos we'd planned for. All in all, though, a fun day. We walked almost the full way around the upper and lower parts of the park--at least eight miles--and ended the day with an hour-long rowboat ride.