I agree with Susan, since you are renting, putting in the time and money for a raised bed might not be that worth while unless you build a box on wheels, so you can take it with you.
Get the largest containers you can find. 20 inch pots
You could plant one tomato, one eggplant, a couple of cucumbers, or several peas and beans and if you use CRW cage it will fit around the outside of the pot
Herbs can go in smaller pots.
You can use recycled stuff for pots. Get 55 gallon drums, wine barrels, and plastic buckets from (restaurants, bakeries. wineries ) food grade barrels cut them in half either way. They make excellent planters and are deep enough and wide enough for carrots, beets and lettuce. 5 gallon buckets good for one pepper, one eggplant (barely), and ginger.
I buy rubbermaid 18 gallon totes and make them into self watering containers.
Zone 8 or 9 you have an extended season so while pretty much noboby grows much in July or August because of the heat, you might be able to get some fall crops going a little later on like broccoli, kale for the cooler months of the year.
I actually am in zone 12a and I will plant broccoli and brussels sprouts in late July and August so they mature in cooler weather. I can grow kale year round although they taste less bitter in the cooler months (it helps to have an icemaker in summer to dump the ice on the kale at night)
Happy gardening in Hawaii. Gardens are where people grow.