Things to do in london?

me and my friend (both 18) have booked to go to london in july for 3 nights and thinking of things to do. we have both been to london seperately so dont the usual sightseeing including the eye, madame tussaunds, buckingham palace. we have already decided to give hyde park a visit for a walk, shopping in covent garden, market shopping (possibly camden), go shopping and drinking in canary wharf (ive been there and its so nice so dragging her there), see a show one night, and go to the ice bar. anybody know of anything else for us to do thats possibly a little less usual? staying right in the centre of covent garden so will be going out at night, any good clubs recommeded? thanks!