I'd never have anything like a hot tub, jacuzzi, swimming pool etc. Just hate hot tubs, and pools are wasteful of electricity unless you use them a lot (I guess if I could have one that was heated by renewable energy I'd be ok with a pool).
Games room with giant snooker table.
More than 2 spare bedrooms (preferably only 1)
Fake grass
Agree with the poster who said massive rooms - I'd rather have 2 smaller rooms than 1 massive one. Could live with one big room, but mostly they'd be fairly standard.
Photos everywhere. Don't mind the odd one here and there, but can't stand an entire gallery!