Just one day? ESFP. A whole week or more? ESTP. Different worlds with different gains, but that's how I'd roll. ESFP would be fun, energetic, and simply exciting. ESTP would get me business connections and I'd get a shit load of things done in that time.
At first I thought the opposite of me. But then I realized that's INFJ and they hit things pretty deep. I'd really rather not. How about a few hours instead of an entire day? Small doses. An entire day as an INFJ sounds like doing an 8 ball of coke in one night.