Add some shade to your deck. This can be as simple as buying a large umbrella or as complex as adding a roof or pergola. Any way you do it, adding shade will increase the amount of time you spend on your deck.
Add some lighting. Low- voltage lighting can be installed on most existing decks with a little extra work. Solar lighting is the easier, cheaper option, but it can be a bigger hassle over the long haul.
Finish the area under your deck. Adding a patio and a under deck water drainage system will make the space under your deck a great place to hang out on hot summer days.
Add storage area under your deck. Adding some skirting or lattice with access doors around your deck can give you a nice place to store lawn tools, toys, or pool equipment.
Add a gate. This will allow you to turn your deck into an outdoor play area for the kids, by keeping them from falling down the steps. It is also a great way to keep pets contained to the deck.
Add some benches. This can be a great space saver. Benches without backs on them can be pushed up against the railing and will take up a lot less room than chairs.
Add a privacy fence. Maybe the reason you aren’t using your deck that much, is because of a privacy issue. Most deck railings can be retrofitted to accommodate a privacy fence.
Give it a facelift. If you have a wood or composite deck, a good, heavy-duty cleaning, and a fresh coat of stain or protectant, can really improve the look of your deck.
Buy new furniture. Adding new furniture will go a long way towards making your deck a more attractive place to hang out.
Decorate. Treat your deck like a room in your house. There are lots of planters that can be hung on the railings. Many companies offer a large selection of signs, clocks, and planters especially for decks