十月底去韓國,有咩野點值得去?

團費好平，２千有找．有沒人去過?　底玩嗎?
yes, very cheap.

Day 1 如果搭完通宵機疲倦，可不可以自行先回酒店休息，不跟團?
l dont think so because the tour will do group check in.
And l dont think they will allow you to leave the tour by yourself.

Day 2 是去"韓食ＤＩＹ大長今"，有沒人去過，悶不悶?　
l only went to 大長今village, it is not inside Seoul. ok la.
but l think 韓食ＤＩＹ大長今 is in another place and l havent been there before. If you like to cook or if you like to have some new experience, why not try it.

Day 2 去完"大長今", 跟隨要去那些人蔘／水晶／蟲草店，如不想去，可否早上離團，下午再ｊｏｉｎ反團到"夢幻世界”?
l think the tour will sell you those products in 人蔘／水晶／蟲草店. May be this is the reason why the tour is cheap. They wont let you leave the tour and travel on your own.
Also, these shops may not be inside Seoul and it is difficult for you to join the group and goto 夢幻世界. Taking public transport in Seoul is not an easy matter for foreigners.

Day 3 是自由活動，有咩野點值得去? 想去睇紅葉，有那裡介紹？
By the end of October, there may not be much red leaves or ginko.
You may try Chang Deok Palace 昌德宮 near In Sa Dong 仁寺洞 or Deok Su Palace 德壽宮 near City Hall 市廳.