Playing in snow can snowball into a lot of points. Accor is offering 3x points for one stay in Germany, Austria or Switzerland during the offer period. Registration is mandatory.
Even though the offer is restricted to one time use per member, there seems to be no restriction on number of nights. This offer will work pretty well if you have a longish stay coming up in any of the participating hotels.
Don't forget to read the remaining terms and conditions on the offer page.