You can message me for a sample contract I've used before, but I highly recommend you have an attorney draft one up or at least review it to make sure it is suitable for your deal. 

Growth resulting in lots of interested visitors and investment ops

I assist in finding investors suitable flip or buy and hold properties. 

After she purchased it we discussed with the remaining tenant that this was possible but only after we found a suitable tenant and that he and his roommate were still bound by the original terms of the lease (the rent they were paying is a bit low anyway).

If you don't have a rental, all your expenses before getting one are considered startup expenses and are limited in amount and scope.If you get an entity (most likely an LLC since S and C corporations are not suitable for buy&hold real estate), then you can start deducting all your business expenses - although most likely accumulating deductions till you'll actually have some income to apply the deductions to it.

Renting the rooms is also a suitable option to cover the mortgage.

My part of Montana is near Glacier National Park and we have seen record number of visitors to our Park this year. 

Is it suitable for other types of tenants?

If first trying to decide between Oahu and Maui, I point to this statistic to my clients who are having similar conversations: "Oahu sees 47% of visitation to Hawaii but only 28% of home and vacation rental activity according to JLL’s survey of visitors, which is deemed representative in that Oahu has the most established hotel stock of the islands." 

The area has year round visitors.