Pops, the boardwalk has no steps or obstructions. It is fine by wheelchair. It starts off as gravel but easily transitions to boards.
The pool was updated in winter of 2012/13 so the stairs into the pool are stable and solid now. The pool bottom is gravel/dirt but the steps go to the pool bottom.
With the upgrade they put in a stair that is metal & concrete with an elevated platform at the top, so accessible for those sitting in a wheelchair. One would need to bum-scoot down the stairs or step down with assistance from the solid handrail.
It is possible to take canes or braces into the pool but keep in mind that the minerals in the water can discolor things or cause reactions between metals.
I took these in March 2013.
This shows the metal set of stairs with an elevated platform at top.
The boardwalk