We live not too far from Wylie... Not much in the way of camping nearby, although there used to be facilities at Lake Lavon (which is real close) - not sure if they are still active though.
Best places around in TX are the state parks but it'd be a pretty good drive from Wylie (if that's your focus destination).
Nothing that comes to mind in the Plano area... If you want to stay close, I'd likely check out that place on Lake Lavon - believe it was called East Fork.
Haven't been by there - but if you're interested can swing by sometime and let you know what we see.
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