In camp?  A pair of light runners.

I've had sandals and they were great, but they blew apart and never got replaced.  Keene style seems smarter to me as open toes catch twigs under the nails and in the fleshy bits.

My biggest issue with shoes is that I wear orthotics and any real amount of walking gets painful without them.  So a proper fitting shoe is best for me.  Otherwise I'd be all about crocs or sandals.