Ps. Ignore the yard mess-Post hurricane cleanup

Once the ivy is removed, nothing...just those magnificent trees.

Good luck removing the ivy....it is pernicious and can have some very deep roots. It will be hard to get out without damaging some of the tree roots.

Since the islands already exist, I'd suggest you combine them into one single island. You can either just leave it mulched or plant with a less aggressive and more attractive groundcover.