I can't believe anyone in the UK would even consider traveling all the way to Hawaii to catch a few poxy bonefish, even though there is more than a fair chance of picking up a double figure fish or two.....If it must be bones, then Abaco will give you an even better chance of a double figure bone, as will Biscayne Bay, and both are a whole lot closer
Now GT's are a different proposition altogether, but again if you want to target them, there are many African destinations that are a lot closer to the UK than Hawaii.
Aenoons suggestion of the Baja
(sea of cortez) would give you a chance at a huge variety of hard fighting fish, but really you would need to go in the summer months to get the best of the fishing