Belfast Dec 27th 10AM - 7PM 3 goals - need guidance please

We did a day trip from Dublin in 2019. We did not do a walking tour. We took a black cab tour first. Our guide just dropped us off at the Titanic Museum. After we toured the Titanic Museum and walked back to the train station area. Had an early dinner, and were back on the train around 5. So if you add the walking tour and leave around 7, that should be doable. Are you doing the walking tour yourself? The black cab tour may already take you to all the places you want to see. Ask if they can drop you off at the Titanic Museum. Then you can either walk or taxi back to the train station area.

ETA: Our guide for the black cab tour picked us up at the train station immediately after our train arrived.

If you end up doing things in a different order than suggested, we had our Black Cab drop off us at the train station for our departure back to Dublin. (We were in a different situation, as we'd stayed in Belfast for a few days on a RS tour, and on our own we then took the Black Cab tour and returned to Dublin on the train.)

I assume you have your UK ETA- https://www.gov.uk/guidance/apply-for-an-electronic-travel-authorisation-eta

It may be an open border, but you still need it.

Thanks for the tips - I think I might go to the Titanic when I first get in and then have the Black Cab pick me up there and drop me off near the train station later that day and just explore the rest of the city then? Also - I think I am ok without the ETA since I will be there on 12/27 and this requirement takes effect early next year?

The Black Cab tour and the Titanic Museum could be done, I think, in the time you have in Belfast. Just to keep in mind, the new train station on Belfast, Belfast Grand Central, is open and operating. Conveniently located not far from City Hall. I was there in late October of this year. Station is nice but not too many services within it yet, such as for food or drink. Those parts were still being finished even tho the station was open for train service.

BTW, the Titanic Museum is very impressive, at least if you have an interest in Titanic. Also, cross the street and wander through the ground floor of the Belfast Titanic Hotel. Old offices and design studios of Harlan and Wolff shipbuilders. Nice place for a pint, in the former design studio space, to the left of the lobby. The hotel is very welcoming for tourist to explore the ground floor.

The sun sets at 4pm on 12/27. I suspect you don't need the sun to see the Titanic Museum.