I camped at the water park - make sure you put on the insect repellent. I got some huge bites from something there... I guess because they like being near water.
Seconded.
HK and I both got bitten by something nasty (as well as the usual midges) there at the ALC AGM meet back in May. The working theory is Blandford flies. Whatever it was caused me to wake up at bladder o'clock and wonder why I had a forearm like Popeye. I believe HK ended up on antibiotics.
If you do cycle into Birmingham the canal is good and much nicer that the road
Yeah, that stretch has a reasonable surface, and you get to see Spaghetti Junction from the underside. Beware broken glass, the Aston ASBO geese and recreational pharmacists on the way into the city centre.
All other approaches to Birmingham from that direction involve some mix of main roads (pick them carefully), convoluted back roads (pick them carefully) or confusing Sustrans routes (you *will* get lost).
Also second the suggestion of plagiarising the Tamworth and Shenstone audax routes for inspiration. Loosely following the Trent is reasonably flat. It gets lumpier to the south. Best avoid crossing the M6 unless you actually want to visit Birmingham.
And of course you could always ride to Sheepy Magna, the Marsh Gibbon of the North.