Welcome aboard Adam, this site definitely is a fantastic resource. And be sure to check back closer to when you're leaving, for more up to the minute reports.
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I fish The Rock a few times in the spring. But, typically in the Kimberling City area. I imagine my experiences would be similar on other parts of the lake; so I'll add my 2 cents, on techniques that work well for us.
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Since the water's pretty clear, it's a good idea to have on some 8 lb fluoro line for starters (maybe even 6 lb?, but I prefer 8). Some good baits that work well for novices (as you mentioned some family members are), if the fish are active; would be to swim a 5" salt&pepper grub on 1/4 ounce jigheads, slow rolling them back to the boat; just fast enough to bump the bottom, or keep the tail flickering. Throwing them around docks and other cover have proven effective, but you may want to scare up some weedless jigheads for those who don't fish often. Otherwise, you'll spend more time getting them out of trees/brush, etc.
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Another, slower technique would be the ole' tried and true Green Pumpkin finesse worm on 1/4 to 1/8 ounce jighead. Creeping it on the bottom. This can be tough for those who don't fish much, just because some people have trouble feeling the bottom. Heck, even seasoned anglers I've had in the boat, think they're dragging the bottom, when they're actually nowhere close. And in turn, not getting bit.
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Both of these methods work great on the spots and smallies. But some of the regulars at The Rock will be able to give more valuable info.