Harmless pranks. Might undress everyone I could find. Although the tempation to burn all the churches I could reach would be attractive.
I would treat it like a "blizzard" day and work on projects at home.
I don’t know if it would be enough time to eliminate the scourge of this country, so I would take care of myself by capturing and hiding large amounts of gold.
Acquire financial stability so I can quit working.
I'd probably go to a secluded beach and pamper myself with no tan lines, good music, a good book and some lovely drinks for the day. Just me, the beach, the waves and the sun enjoying some one-on-one time together. Afterwards, watch the sunset, go home and eat a nice meal and take a bath. Just a decompress day all to myself.