Yes, you can use your own fishing equipment. All fishing is catch and release.
No you can't bring your own kayaks, boats, etc., but they do have canoes and kayaks, and paddle boats for rent.
Loops
Loop 100-300 Preferred (Water, Electric, Cable, Sewer, sand area, close to marina) Loop 300 is a Pet Loop
Loop 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400 - Premium (Water, Electric, Cable, Sewer, All concrete, generally near the center of the campground. (Not sure on pet loops, somebody else can answer that).
Loop 1500, 2000 - Partial Hookup, Water, Electric, Cable, large sand area. 1500 is centrally located, 2000 is kindof remote, but quiet.
Loop 1600, 1700, 1800, 1900 - Full Hookup, Water, Electric, Cable, Sewer, varying size sand areas, further away from some areas. All are Pet Loops.
So basically, you pick what level of site you want to pay for, then on Loops it is better to request what you want to be near. Do you want to be near the marina, do you want to be near the pool?? What size rig do you have. Tell them that and also tell them if you want to be near transportation, or near the comfort station. Asking for a specific loop generally may get you a less than ideal site for your rig.