When winter skies turn clear and the solar activity cooperates, this evening coach tour heads out beyond the city glow in search of the aurora borealis. Expert guides chase the darkest, clearest patches of sky and hand round warm cocoa while you wait for the green and violet ribbons to ripple overhead. Nothing is ever guaranteed with nature, but the operator offers a free repeat trip if the lights fail to appear. Dress in serious thermal layers, bring a tripod for photographs, and give your eyes time to adjust to the dark.