Should be nice weather, why not sailing a bit on the lake?
Not much wind is expected so it may be mostly farniente on the lac!

I plan to start at 11 am, and come back around 3 - 4 pm

You can take something to eat and drink (sandwich...)
Aslo, don't forget:
- sunglasses (and eventually solar cream)
- wind vest (just in case)

Meeting point is there : http://goo.gl/maps/MZPLl

This will be on a 7.6 m sailboat

I ask 30 CHF as a contribution to operating costs.