Do you ahve kids? If so, then you have free babystitting, so go out and get lashed
(well, it's what we do whe the out-laws are here)
Sensibly though,
Bern,
Lac Leman (Montreux)
Boat from Interlaken to the Giesbach Falls and back
Up into the mountains, anywhere
Trömmelbachfalls, Lauterbrunnen valley.
Etc...