✔ 最佳答案
As you only travel France, I would recommend you to purchase France Saver Rail Pass (not just TGV) which includes Eurostar, Thalys, Artesia Day & Night, TGV Lyria, Bruxelles-France TGV, Elipsos, Geneve Med, Paris-Germany Night Train, TGV, Teoz and Lunea (overnight) trains.
France Saver Rail Pass : for 2 people or more travelling together at all times
http://www.francerailpass.com/
You can buy France Saver Rail pass from Hong Kong Student Travel Ltd. 學聯旅遊.
http://railtravel.hkst.com/Eurail_FranceRailpass.asp?passid=28
Besides, it includes some special bonus.
http://railtravel.hkst.com/SpecialBonus_FranceRailpass.asp
2009-05-25 22:52:11 補充:
In Paris, you can buy bulk tickets. Each route costs euro$1.6. but buy 10tickets, just costs euro$11.4. then average each ticket just costs euro$1.
You also can read the below metro, bus, RER map.
http://map.metro-passes.com/paris-metro-map.htm
參考: europe solo traveller, Personal Experience