South - RDU Layover....ideas???

I've got a 3.5 hour layover both directions on a roundtrip to London/Gatwick. Have never flown thru RDU before...any suggestions?
The AAdmirals Club doesn't look like much to write home about as far as AAdmirals Clubs go (translated: not a member, probably not worth the day pass)...but I could be wrong. Looks like there may be some kind of gym nearby that's a short taxi ride, but hard to say. Any suggestions? Cool stuff to eat, see, do, etc. near RDU????
Thanks!!

If you're flying in F or C, check with AA; several airlines that I have been on have allowed those non-members flying in F or C overseas use of their clubs on the day of flight. I don't know AA's policies.

If you are a shopper, there is an "Off Fifth" Saks Fifth Avenue outlet very near the airport, plus a wonderful Italian restaurant in the same complex.