To be honest, you really are wasting your time. Not sure where you plan on doing this, but it would have to be either by a Major city or by a major riding spot to get any amount of visitors to make money.

If you did what to open a museum of Vintage suzuki quads, you will need one of each year LT250R and LT500R. Need a couple different versions of the LT50, LT80, LT125, LT185, and LT230. Then there is the King Quad that came out in the early 90s.
Should try to have completely OEM quads to ones that are deck out to ones with engine swap. To show the difference.
Could include completely destroyed quads too (could get them cheap).

I wouldn't drive to just see a museum of a couple quads unless I was already in the nieghborhood. Now if it was a major museum size with many quads (more than just suzuki), I would be more out to visit the place.

I am just trying to be honest with you. If you do this, more power too you, but be ready to spend major coinage.