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I did a Collection called Amy's Top London To Do which I've done with my parents and they've really enjoyed. Some of the obvious but a few on there are more obscure like Denis Severe's House and a show at the Almeida (you can get £6 tickets and every seat is decent even if it says slightly blocked since it's a small theatre). Seeing a Shakespeare show at the Open Air Theatre in Regent's Park impressed my parents. Such a great venue. Hope this helps! Have fun!

Thanks Amy! That's really funny, I was thinking about going to Dennis Severs' House with them.

If they're looking for a dose of culture, but have already seen the Elgin marbles and the Rosetta Stone, maybe give some of London's lesser known (but equally impressive - and free!) museums like the Sir John Soane museum or the Wallace Collection a look. Also, depending on the weather I suppose, near the Soane are the various Inns of Court which are quite lovely to walk through.