Yes, you just can't buy anything except from the concetionn stand
They have always offered day passes in the past
You can ask for a day pass, to see if you like what they have to offer for sale ? Basically try before you buy!
On certain days they have open days to the public, you may be able to walk in & ask for a few hour pass, i know they have allowed that at the store in Saginaw Michigan
Certain times they have open days. But if it is not one of their open events you will need a membership to shop. If you have a friend who can take you, ask them so you can see if it would be something you'd want to invest in.
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