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From where my barracks was, it was 'across post' from us, being that my training platoon was C 1/31 which was reflagged C 1/22 which inhabited the building by the old quarry.
To get to the museum we had to hit a taxi and go across post.
It was 'in' Fort Sill, but we were restricted in our movement for a bit to the immediate area up to the railroad tracks and the cannon gate.
Not sure as that helps, but it's close to the old post buildings across from clothing and sales.
(I honestly didn't pay attention to HOW I got there by taxi as I was there to pick up some uniform supplies and get back to the barracks. I payed more attention to the immediate surrounding area near my barracks. *chuckle*)
The answer to the question largely depends on whose definition of 'on post' you use.
For us, 'post' was up to the train tracks and nowhere else.
Fort Sill itself extended beyond that point, but those of us in Basic and AIT weren't allowed beyond certain limits until after a certain set point in our training and only then while out on pass.
The museum cannot be missed in all honesty.
It's got all the howitzers sitting outside cordoned off with yellow 'keep away' chains.
*chuckle*
So there's NO way to miss it while driving around.
Now whether or not they allow free travel into Sill after 9/11 I don't know.
I haven't been there since 18th Dec 1996 when I hit my flight out of there to come home and report to my home unit.
Some things may have changed between then and now, but I don't expect them to have moved the museum.
I do remember that if you hit the big "Main PX" you've gone too far.