>>283377tits or gtfo.
but nah, hand sanitizer, wet wipes, whatever. sunblock, aloe in case of burn, calamine lotion, small bandages and shit in case of puncture wounds.
fuck beer, get a bottle of wine or two. you should bring the cooler, because of manly. could put a nice white in the cooler if you are planning on eating what you catch. if so, bring a red(easy to hide since red is not served chilled). tell her its a fishing trip so you only brought coors, then whip out two glasses and a bottle of champagne (maybe too intense for a first date, how much game you got?}
portable music, for relaxin and maxin.
take her to get her fishing license. go shopping for bait and tackle and shit with her. ask her what she thinks would be good for catching fish, then display your knowledge. offer cool tidbits of knowledge you've gained from cool fishing trips but don't spill your spaghetti.
have fun. relax. she's into you if her best friend is giving you inside info. srsly. also, you're going fishing, it's relaxing. if you're nervous it will discredit your fishing guide role as well as display desperation, which ain't gonna get you any tuna.
