This is the age the destination was built for, and a week is easy.
Bikes on the Backcountry Trail. Hire from an operator near the park or bring your own. The paths are paved, flat and closed to cars, and the loop around Gator Lake delivers what its name promises from a safe distance. Go early; there is not much shade on the open sections and it gets hot by ten.
The Gulf State Park Pier. A 1,540-foot concrete pier with about 2,448 feet of rail. Walking out costs a couple of dollars, with under-twelves recently free, and the fun is not the view, it is watching what other people are pulling over the rail. Kingfish, hardtails, the occasional shark that clears the deck of onlookers. Go at dusk.
A dolphin cruise. Two hours out of Orange Beach, resident bottlenose dolphins, and a near-certainty of seeing them. It is the one paid activity here worth booking before you travel.
Waterville USA. Twenty acres of water slides, go-karts, mini golf and arcade on the edge of Gulf Shores, and the default answer to a hot afternoon with a nine-year-old. Water rides shut for lightning, so it is a heat plan rather than a rain plan.
Crabbing and shelling at dusk. Take a torch onto the sand after dark and look for ghost crabs, which come out in numbers on this coast. Free, and it lasts an hour.
A sea turtle nest. Between May and October, if a nest near your stretch of beach is close to hatching, volunteers from Share the Beach sit with it in the evenings and will happily explain what is happening to a curious child. Do not touch, do not use a white torch, do not crowd it.