Clark Lakes are just a short hike beneath Agnew Pass. The trail is still rather simple, but it can be rather steep and loose in places as the picture below illustrates.
Moving on towards Thousand Island Lake the trail is much different than the High Trail. There is much more shade and much more variation in the trail with steeper ascents. The views are not as big nor as grand, but they are there if you keep your eyes open.
The trail becomes particularly steep as you approach Thousand Island Lake. Not that it's really steep, but it is constant and at this altitude it doesn't take much to wear you down.