Xupeng,
I work for the Unofficial Guide (thanks Micca!). I wrote my Masters thesis on computer algorithms for efficient theme park touring. The following papers may be helpful to you:
L. Testa, A. C. Esterline, and G.V. Dozier, "Evolving Efficient Theme Park Tours", Journal of Computing and Information Technology (CIT), Vol. 7, No. 1, pp. 77-92, June 1999.
L. Testa, A. C. Esterline, G. V. Dozier and A. Homaifar: A Comparison of Operators for Solving Time dependent Traveling Salesman Problems Using Genetic Algorithms. GECCO 2000: 995-1102.
I've also got a paper submitted to the European Journal of Operational Research if you're interested.
My Masters thesis is probably available through UMI.com or through my university,
www.ncat.edu.
Hope this helps!
Len