Perhaps not so much a getaway, but the Hilton at Short Hills (near the mall) actually has a nice outdoor and indoor pool/spa with bar. My wife and I have done an afternoon/evening date night there and found it fun. Maybe not so interesting for a weekend though. I don't recall children being there but that could have been the time or day of the week we went.
I believe that Congress Hall in Cape May has an adults only pool.
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My wife and I lucked into a babysitter for this weekend and are now in search of a 2 night getaway. Key requirements are a non-kid friendly pool with drink service.
Anyone here have any suggestions? We are willing to drive a couple of hours.