You can trade into Harborside if you are not set on July and August. The last week in August, Labor Day weekend is possible, since most kids are back to school. Late spring and fall are your most promising times to get a trade to Harborside.
Another option is to either find a direct trade with a Harborside owner or rent your points and rent from a Harborside owner. You can find rentals at redweek.com or just do a search.
What are your feelings about mid-March? Seems like such a great place to go. I would love to be able to get the kids there at some point. Part of me thinks it might even be worth it to risk a hurricane.

Can anyone remind me of what was mentioned about Thanksgiving time??