some ideas

How about Taiwan cherry (there are plenty of those in Okinawa), but there are also some other low chill cherries like kanzakura, okame, and youkouzakura that can be found in the South of Japan. 'Pink Cloud' is one that performs well in Southern California.

What about getting some fragrant varieties of camellia? Camellias are pretty popular in Japan. Or flowering quince.

If you're looking for a rarer one that's more specific to Okinawa there's Fukugi (Garcinia subelliptica), a relative of mangosteen. (in fact they even managed to graft mangosteen onto it, though it had an 85% failure rate) They make tall hedges traditional in Okinawa to help protect from wind, and the native bats eat the little ornamental yellow fruits.

Tree ferns can also be seen in Okinawa. You might want to go with Dicksonia antarctica, because it's cold hardier.

And don't neglect citrus either, the South of Japan does grow citrus. Maybe select a cold hardier variety like Satsuma. Kara mandarin is also good, but better if you have enough heat in your climate to ripen. For those extremely concerned about cold hardiness there's keraji or yuzu.

Also, if you grow some timber bamboo (Phllostachys bambusoides is the one most commonly used to construct things with in Japan) you'll eventually have material to build all sorts of decorative things, if you're good with a saw, but be warned, in that climate this type of bamboo can easily get out of hand (spreading out of control).

Chinese Bayberry (Myrica rubra) is another one traditionally popular in the South of Japan (you can eat the berries).

There's also "Japanese Allspice" (Chimoanthus praecox), not edible but fragrant flowers like jasmine and honeysuckle.

Osmanthus and Camphor tree are two others in the smell category. Fukien Tea (Carmona retusa) can be pretty ornamental, grows very bushy, and yes you can make a tea from its leaves (I think it's good).

Wow those are amazing suggestions. Doug, The Pink Camellia you placed in the first picture its kind of hard to tell but I have a pink crape myrtle there that already looks pretty good. Awesome ideas on the pathway, I was thinking about doing just that and adding a couple of pagodas but lover your placement. I also like the Loquat, what a perfect tree for the area. The Laceleaf weeping Japanese Maple, guessing Tukeyama would likely have a hard time in the backyard due to summer sun exposure. I am going to plant a cover crop this summer in an attempt to fix more nitrogen to the soil then sheet mulch but your idea on path structure is a great one, I was worried I would just streamline the path straight down. You also got me really thinking about rock placement and structure a lot. I like your rock choice as its Traditional Japanese but they are really hard to get here without exorbitant cost. What isn't is Florida Limestone which look fairly similar but are whiter. I like your idea of adding more palms and I plan on covering the chain link with cut bamboo. This is a life long project so I am in no hurry.

Parker, Great Idea on the Tiawan Cherry as a focal point and I like the Garcinia Subelliptica "wonder if that has any connotation to those Garcinia Slim commercials as Okinawa has the Longevity thing going". Chinese Bayberry looks awesome and like it would attact a lot of native wildlife, I can't believe I have never heard of it. I already have 14 citrus trees on our property, a kumquat, limequat, Satsuma "brown select and owari, Pomello, 3 Blood Oranges "Moro, and Vangelliax2", Louisiana Sweet, Washington Navel, Meyer Lemon, Two Home grown grafted everything, a couple of extra small grapefruit and I do have Persian, Australian Finger, and Key Limes in Pots. Maybe I could get some larger Okinawan Designed Concrete Pots for the Limes and Bonsai. I currently pull them in cold weather. I have about 40 different Camellias around the property right now, most in the front and I love them as they put on a show. I just picked up three more Black Magic Camellias. Dicksonia antarctica is an excellent suggestion and then some, thanks for the recommendation on cold hardiness. I was thinking of doing a small black pond liner near the water with a small section of mud bugs, iris, lotus, and edible water chestnut. The Tree ferns would be perfect there. Thank you for the amazing advice, between your two posts I am definitely steering in the right direction as traditional asian gardens let alone a Okinawan theme garden are a little outside my wheelhouse. I found some unique types of rattail raddish and really love the stone raised beds above. Glad I brought in my 3 foot Bannana this year and hope to get it out March for some serious Growth but am tempted to leave it in the pot with the winter we are having. Its expected to get down to 20 tonight, I have a ton of stuff covered. Thank you both for your invaluable insignt and help, hopefully this post will give others some ideas about garden design with oriental gardens as you wouldn't just design an (American garden) in Nevada with Cherries, Dogwoods, Norfolk Island Pine, Maple Trees :)