In Florida, the activity that is only permitted from ½ hour before sunrise to ½ hour after sunset is fishing. Additionally, water skiing and aquaplaning are prohibited during the night and only allowed during the same time frame (½ hour before sunrise to ½ hour after sunset), but the specific question pointed to fishing as the activity limited to this period. Other activities like operating personal watercraft (PWC) are also restricted within these hours, but the direct answer to which activity is only permitted in that time window is fishing.