Do a few lengths of the pool or just cool down in the shallows at North County Aquatic Center. There's loads of fun here for all ages.
You'll have sightseeing choices galore in Sebastian. North County Aquatic Center is a great place to start here, but there are lots of other worthy attractions to enjoy. Bimini Beach, Mel Fisher's Treasure Museum, and St Sebastian River Preserve State Park are close to the aquatic and recreational facility and will fill in your day nicely.