Well, it looks like the river's won this poll. I've counted
8 votes for river boats and klong tours,
5 for the grand palace,
4 for watching river life,
3 for massage at wat po, harmonique and the flowers market,
2 for erawan shrine, chinatown, suan lum, the bed, skytrain, vimanmek, wat arun, jim thompson and wat po.
Will be there in a weeks time so am also very grateful for the contributions.