Hi. Having just moved here, I can give you some information on what renters are looking for. In The Springs area, there are more year-round residents and family homes. There aren't really any "beaches" to go to, unless you buy property on the water and make a beach. With that being said, as a family of 4 we needed 3 bedrooms, 2 bathrooms, a family room, dining room and either a den or an office. It is very difficult to find an affordable rental that is spacious and updated (more modern). I wouldn't say you need to build a "luxury" home, but a tenant will definitely appreciate space and some upgrades. Most properties have nice size yards, but if the yard is fenced in that's a big bonus.
I hope this helps.
If you provide a year-round rental then you don't have to worry about furnishing the house. Another thing you don't have to bother with is utilities - the tenants will assume responsibility for all utilities. One thing I would like to mention is the rental rates around here are ridiculous! If you're going to build a year-round rental, please charge a reasonable monthly rate - $2000 to $3000 a month. Unfortunately, for renters, there aren't a lot of year-round rentals available here, but as a home owner (builder) it would be a great business.