Fly to Geneva (e.g. with British Airways, Easyjet etc.), then I hour by car -- good car hire facilities in Geneva airport, cheaper on french side of airport. Try Airline Network, Car Hire 3000 or maybe Expedia. Alternatively, take the ferry, seacat or eurotunnel to Calais, then 8 or 9 hours by car via A26 to Dijon and across the Jura mountains to Geneva, then take N5 to Thonon Les Bains and D902 towards Morzine -- La Baume is approximately two thirds of the way from Thonon to Morzine.