West Coast US , Gorge, Oregon coast, Sherman river , San Fran bay are all some
of the best summer riding period. A little cold and expensive. So you would have to
add airfare to/from DR and subtract lodging in DR.
That said, Yes, I do go to DR in the summertime as well. But that is only b/c I
live in FL and our house in the Gorge rents out like crazy so we can't always go
when it is rented in summer.
From west coast end june july Maui would also be a very windy destination but expensive
to stay unless you have some contacts. car is needed.
I prefer the Gorge or DR during summer. Be there in a few days