The best time to visit the Heritage Museum and Gardens in Sandwich is the last week in May and the first week in June, when the famous rhododendrons bred by former owner Charles Dexter are in bloom. But there are 100 acres of other attractions. A new innovation is a ''guide by cell'' tour. Visitors can use their own cellphones to dial numbers posted around the gardens to get information on the various plants. The remodeled American History Museum reopens June 29 with the new exhibit, ''Lost Gardens of New England and Cape Cod.''

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