1. Associate Professor, Dept. of Leisure Industry and Health Promotion, National Ilan Univ., No. 1, Sec. 1, Shen-Lung Rd., I-Lan 26047, Taiwan (corresponding author).
2. Ph.D. Candidate, Dept. of Civil Engineering, National Central Univ., No. 300, Jhongda Rd., Jhongli, Taoyuan 32001, Taiwan; and Chief, Tourism Engineering Section, Transportation and Tourism Dept., Hsinchu County Government, No. 10, Guangming 6th Rd., Jhubei, Hsinchu 30210, Taiwan.