Quote from @Jonathan Greene: Quote from @Russell Brazil: The email and acknowledgement serve as the mutually agreed release in writing.

I agree with Chris.

Could also rent it out, controlled by an agreed upon third party that distributes equal pay to each party, and hopefully could also pay the mortgage out of rental proceeds so neither of you are on the hook.

I agree with you.

I agreed with what everyone has already stated here: depending on your own circumstances.

It is different than a lease because some of the information may have been agreed to verbally or changed throughout the lease without being put in writing. 

Frankly I think too many people try and "automate" everything with technology that they complicate things so much that it is hard to manage.Remember you will get older folks staying and they might not want to try and use a tablet.I agree with Michael. 

I agree communication is huge (with anything in life).

I agree with Cory, a few trails would be a cool attraction. 

Without someone knowing the ins and outs of this, the information you receive will be just someones opinion but probably provides no strategy or path on how you should invest the $  I agree with Chris, need more info and beware of the people messaging you on the side.