http://www.nerdwallet.com/rates/savings-account/
Noooooooo no no no no no no no. No! Why would you want a savings account's returns if the stated goal is "early retirement" and taxable accounts and (possibly) HSA are still available?
OP, to answer your question, you need to assess your own goals, risk tolerance, and investment plan (hopefully through something like an Investment Policy Statement). The correct next answer might be max out HSAs if you have the option, or it might be a taxable account with a tax-efficient investment (like a US total market fund) or real estate-- but that's up to your ability to handle risk, your interest in investing the work in real estate, and all the intangible factors that go into making a decision like that.
A fairly safe decision is to start investing in your taxable account if you're not 110% certain you want to get into real estate and all the possible complications that come with that.
As you're in HI, if I were you and wanted to invest in Real Estate, I'd be investing out of area. If you would want acceptable RE returns, you might need to consider that, and really be sure of the answer before you sink large amounts of cash into it. For me, it's a resounding yes-- but it's not for everyone.
My own answer to this question is to max out 401k, then the HSA, then Taxable, with a certain amount of the remaining cash each year going towards downpayments on rental properties. I'm growing a source of monthly cash flow with the real estate while my 401k and Taxable accounts increase. Eventually, my safe withdrawal rate from the investments and the cash flow will combine and easily cover my annual expenses, and I'll RE.