The dont eat factor is out of question, any vegetation you use must be completly out of reach. That being said, in a really large walk into enclosure or in a tropical greenhouse type enclosure, if I were to suggest plants to put in a out of water position and that would do well in the same conditions flys trive in, Monstera, bromeliads and umbrella trees would fill the bill. If brackish water was used, then several mangrove tree species would be great choices.