How Much Money Should You Bring On Vacation At The Beach?

I’ll be staying with my husband and baby for three days, two nights. The hotel is prepaid (I’m not sure if they’ll charge us tax there). We will be eating lunch on the boardwalk most days. My husband wants to purchase a boogie board there. We’re driving about 170 miles. I’m figuring about $50 for gas roundtrip.
Any suggestions? I don’t want to bring too much or too little.

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