Go for a run, lift weights, take a nap, hangout with fam or friends, play with your pet, get laid, if you work, focus on work, go shopping/browsing, look up Ed Gein... among other things.
I haven't taken the real exam yet, but a bunch of my friends who did are using this downtime to finish up apps and hangout with friends, going to bars, seeing movies.. Basically doing stuff they didn't do while prepping :)
... if i am going to hangout here insulting the noricas i ... already have my outfit picked out for june 12th or anything ... as quickly, so check them out if you can find some.