808SUBDVR
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Bikini is only diveable now for very limited periods of the year. There is no dive operation and only a liveaboard that goes there for a month or two.
Unless you like shipwrecks, then I would not go to Chuuk. It is also a lot more "third world" than the other places you mention. If you have a non-diving partner, forget it. You do not need tech certification, there are plenty of wrecks to dive shallower than 30 metres (100 feet) and you mostly do not even need to go deeper than 25 metres. By the way I have been there six times, twice for almost three weeks each time.
Palau is fantastic! Well worth diving.
If you want to do two places, try Guam. Some very good diving there and it has lots of other features.
Hope this helps.
I second Guam. Having lived there for the last ten months now and coming from Hawaii for ten years before, Guam is amazing. Viz outside of Apra harbor is 200'+ almost year round and the water is the most beautiful blue. Viz inside the harbor can be poor a lot of the time due to the boat traffic, but usually you can get 80-100' . Boat rides are usually 20-30 minutes depending if leaving from Cabras in Apra harbor or 15-20 minutes if leaving from Agat harbor. Also plenty of places for any deco/tek that you want to do. Shoot me a message if you'd like to go and I would be more than happy to go out if I am on island.