As an expert you are expected to be able to deal with mosquitoes. There are poisonous plants in some parts of Everglades National Park that can harm or kill you. Poison from the Manchineel tree was used by the Calusa Indians against Ponce de Leon and his men. Eventually, Ponce de Leon was killed by an arrow covered with Manchineel sap. If you rest in the shade of these trees, you will receive droplets of burning sap.
Rain running off the leaves is poisonous.
If you burn the wood, the smoke is poison. If you eat the berries, they may be the last thing you eat. Rubbing the wood on your skin will poison you. As an expert you should be able to recognize the Manchineel tree and all other poisonous plants. As an expert it is expected that you would not be in this race without any special medications required for allergic reactions or for any other reason.