Two things I would recommend for a 93 yr old that can walk with a cane.
Park in the parking lot near the lake (grey shape), and there is a very short paved walking path through the woods right there that leads down to a fishing pier.
If she can go up and down steps, then walk over to the very large shelter by the lake and walk down to the sandy beach area.
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The visitor center is also worth checking out inside and has a nice wrap around deck that you can walk around to the back side for some nice views.
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