If you're just there for the day I'm not sure I'd bother with the bus to Haworth - Haworth is probably worth a day trip in itself, especially if you're going to the museum and steam train. I have a bit of a love-hate relationship with Hebden, but it is nice to visit as a tourist. If you like a walk I'd recommend either up the canal to Todmorden (easy, plus you can get train or bus back, very regular service) or (much longer) up to Hardcastle Crags which gorgeous. Food in the Trades Club (tea time only) is great and reasonably priced. Lots of shops selling expensive tat, lots of cafes (personal favourite is Squeeze on Crown St) plenty of bars / pubs (my recommendations would be Drink! on Market St and the Fox and Goose, right on the western edge of town which is a community co-operative pub with great atmosphere and large outdoor area.
If you're coming on the train you'll likely be passing through Halifax which is well worth a visit these days too - the Piece Hall is five mins from the station and is stunning.