It's fairly well-mapped on Google so this might give you a sense of the elevations/distances.

Here's the view of where the buses drop off versus the entrance turnstiles: https://www.google.com/maps/@-13.165...7i13312!8i6656

There's also extensive google detail inside so you can view from ground level and wander through on the computer to get a sense of it.

As Section 107 indicated, it's not a "hike" in the traditional sense of dirt trails with brush, loose rocks, boulders, etc. It's mostly paths and steps. The challenge is that the steps can be somewhat irregular (really steep steps) so you do have to pay attention to where you're going.