West Common, South Common, Hartsholme park, Whisby nature park, Viking Way along cliff edge villages (Waddington, Harmston etc), Chambers Farm Wood, cliff paths Burton and further north, river bank along to South Hykeham, Aubourn, Skellingthorpe Old Wood / Doddington / Harby. Loads of footpaths around Potterhanworth / Nocton / Dunston.
I'm 5'11", and have got some Concurve (now Gore) thermal tights for the winter, and also a pair of Nike tights. They could do with being another inch longer ideally, but they aren't too bad. But most of the time I wear short tights or 3/4 length ones.