Build vs. is a common question. just b/c you own the land doesn't you'll be allowed to develop it into a park either. Lots of potential hurdles but it can be a great investment AND fun! I'll send you my ebook on Building an RV Park so you can get an idea of the pros and cons.
I personally love the RV Park business model. I put parks into two categories; resort or residential. Resort are the destination type parks while residential are just Mobile Home Parks full of RVs. Resorts can be seasonal so you need to plan your cashflow accordingly. Residential can be cash cows if managed correctly. They don't need any amenities other than being clean, safe and near an area with either large construction or in need of affordable housing (which is almost everywhere.
As Don mentioned being overleveraged is a problem if the owners don't understand how to manage the park and have true financials instead of trying to base off of pro formas. New Park owners often underestimate how long it can take to build and then fill a park. Existing parks, even with bad reputations, can quickly be turned around with the right management and ownership.
Remember, "The Park takes on the personality of the owners" so if you treat it like your personal ATM and let maintenance go,it will show. If you run it like the business it is and realize you are in the Hospitality and/or Housing industry then you can realize double-digit returns easily -well, if you buy it right.
It sounds like you got a great location for a seasonal park. Check out nearby park rates and occupancy to start your due diligence and also become extremely friendly with local permitting authorities. Meet with any pre-development team you can to get a feel for what they would require from you.
There is a site called "hipcamp.com" that lets folks rent or stay on private land. Some are just primitive camping, others have RVs or cabins. It's kind of like airbnb but for camp sites. Lots of considerations but don't let anything hold you back if that's what you want to do.
Good luck!