great thread- we have the same opportunity, but for 4 to 5 days, and I have been going nuts trying to think of some places to go!
we have not been to Cape May or the Poconos, so those are possibilities for us. Have been every where else mentioned, so would welcome more ideas.
for the OP - highly recommend St Michael's. We have been several times, and have taken friends who all loved it. Do not think you will be disappointed!