pretty simple Danny, drive in lagoon, park at the seawall walk to the showers - walk back to boat drive back to island. Actually there is a bathroom at the ramp too, so thats quicker than driving back in there at idle. As far as showers, Dial soap will lather in saltwater and then a few gallon jugs of freshwater for the rinse - 1 gal does 2 people usually.
FYI - no beer allowed - they will check coolers now - so pick a mixer like Coke or Sprite and have a runners squeeze bottle handy of whatever
You just can't hide beer
Sandy the place will be over run with Tarpon from the skyway to egmont key and all along the beach - almost as good as Boca Grande