Launch at Marlow using the slipway at the End of St Peters Street.
Park car on Mill Road near the lock (Buy your EA licence at the Lock!)
Get wife to pick you up at lock (less than 50m)
Head DOWN stream through the lock towards Cookham. There are loads of fields either side of the river on the way down to cookham, perfect for picnics.
I would then urge you to go through Cookham lock and head down past Cliveden House for some really picturesque views.