1) Setting up a 403B (our district does not offer matching, so the sole benefit would be tax deferral)
Tax deferral is a pretty nice benefit all on its own for those in a higher tax bracket!
2) Setting up a solo 401... Though I'm not sure if it's legal to have both a 403b and a 401k... nor am I certain how to set this up.
It's legal to have both, but the combined employee deferral can't exceed $18k between the two accounts. Do note, however, that you can put in 25% of earnings into a solo 401(k) tax-deferred from the employer side above and beyond the $18k limit, so it would be a way to shelter some of your blog income.
Also if your 403(b) plan has bad funds, you may decide to do as much of the $18k as possible into the solo 401(k) instead of the 403(b).
3) Switching from roth IRA's to traditional IRA's... right now we're being taxed at the 25% bracket... i'm not sure if the traditional would be a greater advantage
With Roth vs. traditional, the big question is whether you expect your tax bracket to be higher now or in retirement. The more money you already have in Roth (or taxable accounts, for that matter), the less of your spending during retirement will count as income for tax purposes, which will make it less likely that Roth was the optimal choice!
If your income ends up being low enough to make pre-tax traditional contributions, strongly consider it.
4) Investing in real estate... I've always loved the idea of being a land lord, but have no idea how the real estate investments would affect taxes.
There are some nice tax breaks for landlords, in that you only need to report net income after all expenses (including depreciation and mortgage interest), but it can be a lot of work. Be sure that you're willing to do it before you dive in.