Can you attach a credit card to a room to pay for things around the property?

Yes

yea ball out treat yourself

Absolutely, I just wouldn't do that. If you have a rental car a supermarket and a dollar store is just down the block.

You sure can. Was just there last week and they ask if you'd like to add a card for incidentals. They will put a $50/night hold on your card if you do give them one.

I think so