I've done this creek quite a few times. It's a nice slow and easy trip and great for camping. Ship Island - Ship Island is a fun day trip. The boat schedule is listed on the site. There is a very nice camp store on the island and they have umbrellas and chairs for rent there.
Ship Island is also the home of Fort Massachusetts and they have tours a couple of times a day.
Pat Harrison Waterway provides clean, very well kept campgrounds, with great camp stores. Golf Courses - Hattiesburg has been steadily increasing the number of golf courses it has, and now boasts 12 beautiful courses. I can't say personally how the courses are, but I've only heard good things about them from people who play. Definitely worth a try if you enjoy golf. Very smooth surface, small inclines, wide trail and easy access.