I highly recommend walking across the bridge into town. The buildings along the waterfront are very picturesque and colorful. Any beach along Seaquarium is nice, espeically the Princess Hotel area.
Snorkeling and diving on Curacao are tops. The coral formations haven't been damaged as much as other "over-touristed" areas. This is also highly recommended.
I agree with LisaK, this is a great little island to get out and see. Shopping will be better on St. Thomas, but you should be able to find some nice mahogany pieces here, similar to Aruba, only cheaper.