Personally, I always take a lightweight collapsible chair. It is preferable to either sitting on the floor or on the NR metal seats which can be very cold. The chairs cost about £15 from most supermarkets (Asda etc).
About six weeks ago I bought a Pentax Optio E85 for £79.95, it has so many whistles and bells that I hav'nt mastered them all yet but it takes superb photos, ideal for spotters who need quick snaps.