You've just opened yourself up to a barrage of "back and forth" bantering about how evil "offshore" boats are, and it's my guess that that will become the main focus of all the responses. Therefore, before all the foolishness starts, let me throw my two cents in to give my opinion on the subject you asked.
I'm an experienced boater on the lake for the past 15 years in a boat about your size (19') - and the "offshore" boats are not as big of a problem as you'd think by reading this forum. (According to some people on here, "offshore" owners run over little old ladys on purpose and eat little children) - However, it's just common sense to be aware of your surroundings - if you see a 38' cigarette boat bearing down on you - move.
Also, buy a Bizer chart when you get to the lake - it's hands-down the best of the charts for navigation.
In my opinion, stay away from Weirs Beach/Meredith and the middle of The Broads. It's just way too busy/rough for a boat of that size. This is solely my opinion - especially if it's on the weekend. It just gets so busy there, you won't enjoy yourself. There are plenty of places to see/go/fish elsewhere on the lake.
Enjoy.