SUBJECT LINE: Fifty Boston-area summer recreation sites

Free tours are the first Tuesday of the month at 9 a.m., with a special 10 a.m. tour Saturday, Aug. 4. Groups can book other times. Take home a souvenir bag of fertilizer. And, don't worry, you won't have to hold your nose. 617-539-4248. 10. Pitch a tent. The Boston Harbor Islands are an oasis of unspoiled beauty within sight of downtown. ................
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