Jenny Lake is a very busy location from 800am-230pm. If planning for boat to hidden springs waterfalls, plan 30-60 minutes on top of hiking times into your trip times.
Parking is a zoo, at peak you risk circling lots and getting stuck..or park alongside road and have a significant walk into area.
Our crew of 5, ranging age 4-65 opted for hiking to falls (2.4 miles + 0.3 miles). This took 1 hour 30 minutes with brief stop and a consistent pace. The perimeter trail does have ups and downs but overall well graded. We took boat back (40 minute wait for ride at 1pm).
The waterfall extension is shorter when coming from trail. Well graded.
Inspiration point extension (0.5miles) is moderate in nature with final switchbacks over smooth uneven granite rock. It offers expanded views of lake. There's more majestic views driving honestly.
We regret running out of time and not doing the canyon trail extension. Peers coming back by boat had robust animal viewings extending 1 mile into the canyon trail including bear, elk, and moose.