I agree that it needs to be a lot more beachy. I like the color in the upstairs room, I think continuing that color or something similar throughout will give it a more vibrant look. Are you purchasing it furnished? The living room furniture is really dark and too bulky for the space. Maybe just the sectional? Instead of the recliner a smaller side chair. If you're not keeping the furniture, I would invest in a sleeper sofa to increase the occupancy.

Take a look at Sherwin Williams Sea Salt. It implies beachy without being in your face. You can imply beachy with use of colors and textures without being theme like. Look at Sunbrella or Krypton fabrics for furnishings since they're tough wearing and easy to clean. You could also consider furnishings with slipcovers so they can be washed. In the bedrooms, use duvet covers and with light down alternative comforters so they can easily be pulled off and thrown in the wash. Keep an eye out on Craigslist since you are in a coastal area for furniture that is being sold. Use Marshalls, Home Goods and TJ Maxx for stylish accessories that aren't too expensive. Don't use too many small decorative items that might walk away. Stick to larger artwork, etc. Congratulations on your new home!