Elfin, if you're a fan of that sort of stuff then it's a lovely walk/ride down that stretch of the canal from Kirkstall down into town. Loads of interesting things down there. My favourite bit is probably the huge substation between Kirkstall and Armley – this is next to the Canal on a service road which runs parallel to it. No pics sorry – need to get down there one night – looks great all lit up.
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It's also worth checking out Eastmoor Campus up in Adel. It's an old Borstal which has been deserted – looks like a ghost town. Nature is rapidly reclaiming it – very eerie.
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If you're taking the bike then I can put you together a nice route which links them together – let me know.