I'm pretty sure they have gift certs/cards. Not sure about getting change.
Most of the time you don't get physical money change on gift cards, the remaining balance can be applied to a future purchase or added as part of the tip to the server, hopefully you've already taught your student about tipping so that shouldn't be an issue. Hope this helps!
Yes on bus but he can walk to Cabo. It's only a few blocks from campus.
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