ILAM, Sept 28: The beautiful hills of Ilam and thrilling bicycle ride there. What could be more thrilling than this, claims well known cyclist Pushkar Shah. On Monday the 37th world tourism day was marked by bicyclists across the globe through countless formal and informal programs. The same day, a group led by Shah was paddling their cycles hard in the muddy fields of eastern hills. Though incessant rainfall in the past few days had left the cycling trek muddy and slippery, it could not stop the group from going ahead of their plans to ride bicycle in green hills to mark the tourism day.