Hi P.,
You need to get out the calender and write down what you are going to do with your son. For instance, on Tuesday we are going to the beach. Next, Wednesday we are going to the zoo. etc. If you have a friend with a small child call her and schedule a few things in advance and put them on the calender!
Let your husband know your plans and don't feel guilty that you are leaving him behind. Believe me he probably wants time alone as much as you do! If he knows when you are leaving and where you are going then he will also be able to make plans for those times.
There are many free or inexpensive outdoor things to do with little ones. Even a ride on the train to Boston to ride the Swan boats is a big adventure and pack a picnic! The common has a great park and a sprinkler, so a change of clothes is a must! The free parents magazines they provide in supermarkets etc. list numerous acitvities, farms, etc.
Go out and enjoy summer with your son, but even though it seems summer should be relaxed and unplanned, if you do not plan in fun your days will be consumed with mundane tasks and September will be here before you know it. Oh, yeah I live near a small airport which has a luncheonette (like something from Bogart!) When my girls were very small we loved driving over for lunch and watch the planes land and take off. We would imagine the places they would travel to. Have a great rest of the summer!
J. L.
P.S. After reading your other responses I just had to come back and edit. It sounded like you and your husband were just tripping over each other and that his main concern was finding employment and yours was enjoying the summer with your son. That is understandable, as other responders have written your husband will have a very difficult time relaxing and having fun while he has no job, and you have the right to enjoy your summer with your little boy. My suggestion was that often times we just hang around out of guilt towards our husbands when we would both be happier with a little to space to do what we want (need) to do. Best Wishes!