Take your $7.5M and diversify it now. That’s your nest egg, don’t play with it if you are ready to FIRE.
Where in Hawaii are you looking? We’re on the Big Island now (hiding from COVID the best we can) but the schools here aren’t good unless you go private.
If you’re planning to get a mortgage (which I’d suggest considering rates are so low) be sure to buy before you FIRE because getting an assets-based mortgage (rather than income/salary) means higher rates.