Aaahhh - what to do when it's raining? I have to say that over recent years at Sisteron I reckon that on average I fly about five days out of seven, which is a good hit rate by UK standards (especially in a standard British summer). Assuming that fettling is not required, and one has been adequately scared by visiting all the outlanding fields that one needs to, then a scenic drive to a village restaurant would be my choice. The smaller the village, the better, in my opinion; it certainly beats trawling through the supermarkets.