Putting together the puzzle of weather, tide, bait is a big one for me. The visual aesthetics of a bright orange redfish cruising along the oysters or a trout flushing a topwater and even getting a jig a little ways down its throat and frothing the water head-shaking when being reeled in. The sound of a 18 inch plus trout thumping the fiberglass after you've hoisted it in. The wild acrobatics of a trout on a Slpap-Stick with the third set of trebles hooked in the head or near the pec fin.
I could go on and on...