Its good for commercial applications and playgrounds.  

Not in the spirit of federal loan (government subsidized) loans, the SAFE Act, potentially fraud statutes, may be against 'public policy' interests, etc.

You are taking a great initial step to educating yourself about real estate and working toward implementing what could be a life-long income strategy.While a passive "market based" investing is a great way to approach a well rounded strategy, there is no replacement for safe real estate investing.Most people can retire on 5 good rental properties. 1800 x 5 = $9K per month.

I understand EMF's are bad but is there a safe distance? 

I am very anxious and motivated to learn how to profit safely and transition out of my "job".

You earnest money will be 100% safe if you learn some of trick of the trade. 

You can be as safe or risky as your investment risk profile can tolerate.

To add onto the other example there is also a "Safe Harbor" of $50 per square foot that you can deduct too; however, much of this depends upon your business to determine if it is allowed or not.

Is it safe to assume that when rates go up (which we have to assume they will), that refi's won't be as viable an option anymore for investors?  

Because this is your first park this might be the perfect and safe opportunity for you to get in and establish yourself in this niche.There is definitely much due diligence to proceed with moving forward.