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Your mileage may vary, but Map My Run seems to be the one that craps the least. I am jealous of the Sky Garden. Upon first visiting Los Angeles in the '90s I had the idea of starting a place like that and calling it Silent Running. Unfortunately I am not a bilionaire. I enjoyed the shit out of the Tate Modern, but you may not.
Seconded about the Tate. Sometimes expos are not the most interesting and very expensive(I think it was like 20 something pounds last time I went! Who has that kind of money!?), but at least walk in for the architecture of the place and check out the free exhibit. There's a really cool market walking distance away too :)