A little landscaping done, now gotta do some planting..

Okay, so here's what I did....

I dug a pit for water collection. The water runs off my roof and down the trench in the bottom-center of the picture and will fill that pit and provide water for the banana plant and the raised bed with the cardboard covering (it's sheet mulched, I just have the covering temporarily until plant roots stabilize the soil).Really just playing around with stuff, seeing how it goes. I live in Florida. Fun fact, hehe.
I'm gonna plant peas to run up the fence, but was wondering what plants I could plant with success around the watery collecty pondy thingy. Maybe eggplants would do well around the outside edge of the bed farther away from the pond? Also, what are the effects of peas trellising on plants? Can they be parasitic in any ways?
The tree in the foreground is this tree:

It has red-orange roots which crawl very close to the surface. Any one able to identify it? I'll post it in the ID forum too...
Are there any distinguishing features among nitrogen fixing trees which makes them.. well... distinguishable?
I'm so full of questions, thank you for your time reading and considering them!

You must be fairly far south in FL...that tree looks tropical and I don't know it. I would guess it' too hot to plant peas there now, unless you mean cowpeas, only a few varieties of which make vines. Any vine will have trouble climbing that board fence unless you lay some sticks or mesh or something up against it...the vines have to twine around something. Other vines can cling to a rough surface, like ivy, but none that I know of are edible.