Cayo Costa State Park is on the entrance to Charlotte Harbor.
Sea conditions from Big Carlos Pass to Cayo and Boca Grande appear and I have not yakked to Cayo, always calm for example
http://forecast.weather.gov/MapClick.php?lat=26.707586641427362&lon=-82.26699829101562an excellent novice camping trip: Pine Island to Cayo SP then down the coast south and back to Pine.
No tsunami.
Seas outside Sanibel and Captiva normally calm.