In Lisbon - 1 night & 1 day - any recommendations?

Hello Lisbon Internations Members, I am extending my business trip by one day this week for the evening of the 2 June and flying home late Wednesday on the 3rd June. I will be travelling alone so I thought I'd ask you guys for recommendations for where to go out for the evening AND/OR would anybody like to meet up? Plus I would love to hear your top tips of sights to visit in your beautify city on Wednesday. Obrigado! Kate