All renovations are not created equal.
Curb appeal is one of the most common updates - some buyers won't bother to come into the house if the exterior is not looking it's best.
Some say that the greatest return for your investment is a mid-range bathroom remodel, a $3,000 job that returns $1.71 for every dollar spent.
Some say that the worst home improvements for value are kitchen remodeling and finishing a basement. A top-of-the-line kitchen reno will cost you $22,000, and you’ll only get about $0.51 back for every $1 you spend - I have found that buyers LOVE the remodeled kitchen.
You might consider adding a deck or windows.... just be careful that you aren't spending money that would be better spent for buyer's closing costs or other incentives.