So you know, you can buy vouchers from the SBB for any amount. The price of a 5-day Lake Geneva Regional Pass is 94 CHF, so a voucher for 188 CHF would be basically the same as giving them the tickets. If I recall correctly, you can even get a personal message printed on it, so you could have it say something like "Valid for two 5-Day Regional Passes". You can also get a nice glossy brochure for the passes at the station that includes a synoptic map and some pretty pictures to give along with with the voucher and card. All they would need to do is make a quick exchange at the ticket counter when they arrive in Switzerland, and they'd be set! The vouchers are valid for a long time (something like three years) so there's not need to worry about the recipients having to use them immediately.

Heather