Parking is available at a variey of garages near the arena. I usually park in the one across the street. Most garages take cash and credit. Sometimes for special events, it may be cash only upon entry. There is also websites that let you prepay but i find that's most expensive.
Both, but having cash (at least $20) gives you more options.
Both I use credit
It is just easier to take the cash with you.
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