You need to consider your audience (guests), @Meghan94 , in order to determine the value of buying and installing TVs. I have a TV in both the living room and bedroom. My renters tend to skew middle age to older. Often they are couples although I do have families and singles who book long term (7 - 21 days).
During the post-visit inspection, I tend to notice that couples have utilized one or both units while others less so. The TVs that I installed were older units that I had available. I didn't purchase anything new. Also, there are only broadcast channels provided and DVD players, so no added expense for cable/satellite.
I agree with @Anonymous that you should take any extra funds to invest in improvements. If you were to find that your guests are clamoring for TVs, you could go that route, but I suspect for a seasonal beach property, your guests are looking for other features.