Here we have The Deep. They have penguins! https://www.thedeep.co.uk/
Maritime Museum (has an original Viking longboat which is pretty cool)
Wilberforce House, home of William Wilberforce who played a huge part in the abolition of the slave trade.
Fish Trail (don't ask!)
Ferens Art Gallery
East Park (has kind of a mini-zoo)
Other museums whose names I can't remember.
The seaside is very close, although a bit cold!
Humber Bridge Country Park
The usual bowling, laser quest, cinema etc.
Arctic Corsair
Spurn Lightship
And.......

The public toilets in the town centre!!!!!

Yes, you read that correctly. Apparently our toilets are pretty famous, tourists actually come to see them!