What you can do with your soil is have it tested and start amending with good compost. When you get your soil test and if you need to make pH adjustments, the test will tell you how much sulfur to add. Since it takes 6 months for the pH to be changed ultimately by soil bacteria, your garden should be ready to plant in the fall. You can plant now in pots and potting soil.
If you make a raised bed and fill it with good soil or use the formula 1/3 good quality compost from multiple sources, 1/3 peat moss, 1/3 drainage material vermiculite, perlite or coarse builder's sand. and add fertilizer, it will be good to go. Do not add any lime. I like a fertilizer with micronutrients and numbers under 15 if possible; under 10 is better.
A keyhole garden might be a better design for you as it makes the most of recycled water and has a built in compost pile. You can also build it so you can shade it in summer.
The garden can be made out of any readily available materials. A 6 ft garden is about as big as you can get and still have the water reach the edge from the central basket. It produces a lot of food but some plants are not recommended.
A shelter can be made of wire or flexible branches or conduit tubing. It can be used as a trellis or can be covered to provide shade in summer or in when it is colder, it can be covered with plastic to make a winter greenhouse.
https://bakerinstitute.org/media/files/ ... nglish.pdf
https://www.texascooppower.com/texas-sto ... -gardening
Happy gardening in Hawaii. Gardens are where people grow.