If you have 24 hours to spend in Rhyl, there are plenty of things to do and see!
Firstly, head to the Rhyl SeaQuarium and spend around 2-3 hours exploring the various tanks and exhibits.
Next, head to the Rhyl promenade and walk along the sandy beach, which could take around an hour or two depending on how far you walk.
After that, head to the Rhyl Sun Centre for an afternoon of water park fun, which could take around 3-4 hours.
Later on, head to Rhyl Pavilion Theatre for an evening show or concert, which could take around 2-3 hours.
Finally, end the night with a meal at one of Rhyl's many restaurants or pubs.
Overall, this should give you a fun-filled day in Rhyl with lots to do!