I have family in the Myrtle beach area and I love the combination of family, entertainment and beach aspects.

You're in for 0 and collecting 1500/month.Stay away from the amateurish approach to this: On market purchase based off of inflated ARVs shown to you by a wholesaler or agent, then use a Yellow Pages GC, combined with not so friendly loan terms and now you say bye-bye to your money.  

That’s why more families are teaming up and pooling their resources.By combining incomes and sharing expenses like the mortgage, utility bills, and more, multi-generational living offers a way to overcome financial challenges that might otherwise put homeownership out of reach.

Buy the next property below market value so you can house-hack, live-in flip, or do a combination if the wife to agrees with it.

Sign up for turbotenant and use their lease creation functionality 

One thing to add, I would also create a 3rd listing with the two properties combined so people can rent them together.  

I reconfigured the space for proper flow, added a bathroom, and turned it into a functional, modern 3 bed, 2 bath.

Keep it clean, safe, and functional.

Run-of-the-mill nice is fine, but to excel, you need to do something different (interesting design, or game rooms, or hot tubs, or themes, or some combination of these or other tactics). 

Could diversify with a combination of long-term rentals, mid-term, real estate debt funds, other types of investments (REITs, index funds, etc) - not sure of the tax implications with 1031.