I remember reading apost about night fishing for tarpon on the danblanton.com website. I would post a question there or search back a few pages lokking for for additional info. If you are stuck in Bleize city for a day I would consider fishing with actionbelize.com or trying to secure a day trip with the belize river lodge guides. Belize city is not very cosmopolitan and they have few sights worth seeing there. I would get as much fishing in as I could.