Try Pannet Park Museum, art gallery section is free and will take (me at least) a couple of hours. Admission to the main section is of particular interest to those of a maritime disposition and likely to need another couple of hours, free to locals and not dear for the rest.

The town itself is worth exploring on foot, bring stout footware and be prepared to climb steps. Parking is a nightmare (especially in summer) and driving anywhere within the town boundary more trouble than walking, as well as missing most of the interesting bits.

Steam bus has alas moved on, but steam trains still running, also ghost walks and a variety of boats trips (whales are seasonal, best to come September if you are bothered)

Folky activity somewhat diminished from its peak, but still the annual festival and the two weekly sessions mentioned, plus odd ad-hoc stuff from time to time. The area round about offers Bayfolk & Mickleby, folky alternatives if you don't mind 'out of town'.

Raggy is, I believe, in transit at the moment.