Bare minimum?
I once rode a waterbike (don't know what they're really called) with my sister. It was a spontaneous invitation. We were on the beach. All I had on me at the time for some reason were my swim trunks. You know the tiny pocket swim trunks have? I stuffed one of my tiny Schrade Old-Timers in there.
The items I normally always with me are my Inova X5-T, Sure E2e, one of my SAKs, and lip balm.
I have yet to try getting my EDC lanyard through a security checkpoint. It contains no sharps except for an Uncle Bill's Sliver Gripper.
-- Craig