Family room: Centering your largest piece (sofa) at the fireplace is good. Try using the matching chairs opposite the love seat to make a grouping and add a rug large enough to have the front legs on the rug to anchor the room. It doesn't matter which side you place the love seat on. Then try placing the sofa table behind one of the pieces. It does appear that you are restricted because I believe you may have a stairway entering the space. Then, try to make a reading nook with the other chair in the corner. You will have to play around with the other table set or just store it. It is a family room first!
I know you must be thinking along the lines of a game table or extra seating. If you can store it, the renters can always bring it to the space. Are you leasing long term or short term?

It would be nice to use it outside on the deck, if it is possible. I dont' know if it is weather resistant.

For the master bedroom (floral) and second bedroom: hang the pictures 6" above the headboard to have a focal point and paint the rooms a warm beige. (Sorry, it is hard without seeing the light in the room).
For the white wicker w/yellow spreads: do the same or paint a pastel blue. Move pictures up a tad, add small vase of greens to the night stand.

Room with green/red spreads: Same thing or a cool green. Remove pictures totally, that are over the bed, add bed shirts to cover the frames. They sell bed risers at bed bath & beyond if you want to try elevating.

Do you need to have two sets of bunks? If not, set up as twins to make the room look larger. I can't imagine renting to accomodate that many people without totally destroying your place!

Pool Room/Sitting Room: Face the sofa towards the pool table and use the end tables accordingly, (not scattered). Remove the pictures near the TV so as not to draw attention to it.

Deck: Add some planters to the railings or some pots of plants to bring color. Try to have a nice seating area.

Play around. Start with your largest piece facing a focal point, bring in next largest pieces to form groups of seating. Add you lighting, trying to form a triangle around the room and lastly accessorize.
A shallow bowl with some beach sand and some tea lights would look nice on the coffee table. When grouping candle sticks, think in threes.
Good luck!