I don't know how it is for you, but summer just seems to evaporate for me.  For one thing we have a huge garden and we all try to spend two hours each morning working in it.  Some of my children think this is outrageous, but I think it is good for them.  There is the normal housework, which we try to do a little more thoroughly and diligently in the summer, actually changing sheets weekly, etc.  Then of course there are graduations, weddings, holidays and company that fills up many weekends.  A few years ago I realized that summer was slipping by without us finding time to have fun and relax together, so we began a tradition that if the children work hard and get their work done the first four days of the week we pack a picnic lunch and head to a park for the day Friday.  We take our camp chairs and nature notebooks, sometimes a good book and a picnic basket of food and enjoy relaxing together.  Looking forward to our outings turns out to be a good motivator for all that work that needs to be done early in the week and some of our best memories are made relaxing together.