W5 is Belfast's hands-on science and discovery centre in the Titanic Quarter, designed around interactive exhibits rather than static cases. It is aimed especially at families, with experiments, building zones, and changing activities that can absorb children for a few hours.
For adults without kids it is optional, but the location makes it easy to combine with Titanic Belfast or the waterfront. It is a practical wet-weather choice and one of the city's better family attractions.