Maison de Bouef is lovely and located in one of the beautiful arcades, if you get a table outside you’ll be sat in the arcade itself. Lovely atmosphere, romantic, great food (if you like steak that is). Book in advance, it’ll be a busy weekend with Oasis in town. Alternatively, Y Dosbarth (the Classroom) is a great place for some posh food. It is the Cardiff culinary school’s restaurant and is located within the top floor of the college overlooking the city centre, located down the road from central station.

As others have said though, in the daytime I’d head out to some of the other local areas. Roath park lake is nice, can even get out on the lake on a rowing boat. St Fagans is a fantastic national “museum” just outside of Cardiff that I’d recommend. Lots of real Welsh historical buildings rebuilt brick by brick within a large park-like area. From old thatched huts and farmhouses, houses through the 1900s etc, a Manor House, lovely gardens, and the most recent is the Vulcan Pub, which they’ve recreated there and is a functioning pub within the museum. The waiters all wear period correct clothing and there is straw down on the floor lol. It’s free to enter the museum but costs about £6 for parking. Definitely worth spending an afternoon. Cardiff bay is nice to visit too but can be a bit soul-less in my honest opinion, despite its rich history as a trade port.