warning sign dangerous surf

abstract activity adventure adventurous bay beach caution challenge climbing closed danger dangerous date energy explore flag guard hawaii hazard hazardous high horizontal life natural nature nobody north notice oahu ocean outdoors phenomena power powerful precaution protected risk risky rocks safe safety sand sandy sea seashore shore sign signage sneaker storm surf surge swell swimming threat threatening tidal tourism travel tropical tropics tsunami unguarded unprotected unsafe wading warn warned warning watchful water wave waves