I've been once this year but I'd really like to see it when there's more than 5 hours of daylight. But it's a bit pricey in the summer. I can't think of anything.
My other preference is a beach, preferably on the Atlantic. Quiet. Not too touristy. Warm water, nice weather. Not too far - no 16 hour flights please.
Or maybe a city? Quick, name me some cities in North America that are nice to visit in the summer. I'll have to save the European ones for the low season.