I dont htink doing it aside the beach is the best idea. I have heard that plants that have been planted in the sand were killed from the breeze coming off a saltwater ocean. I guess the plants cant handle big ammounts of salt lol. Try maybe near a river thats not salt water or a lake that isnt salt water. Make sure theres a good opening over top and your grow is set around other plants in 1 area so people dont spot it so easily.