Take in a play or a musical. While small, it sometimes gets interesting productions and shows films at the end of their cinematic runs.
The best attraction in Colwyn Bay, while not a large zoo, the interesting location on a hillside (not quite the 'Mountain' advertised) allows for more interesting habitats for animals. A free bus usually runs from Colwyn Bay train station. However, check the zoo's website to find out when it's running.
A large, grassy park about 20 minutes walk from the town centre. As well as the park with its boating lake, there is a fairly well equipped leisure centre with indoor pool, squash and tennis courts, and a good athletics track. There is also a new skate-park on the grounds
On the promenade is the town's "Victoria Pier" which is in a sad state and in dire need of renovation.