The route of 10km is mainly flat ?

run4fun

you will go downslope and upslope near Taikooshing....then when returning back at the same place (taikooshing), the same downslope and upslope....at the end near the Cross Harbour Tunnel , there is a flyover which is a deadly slope as mentioned by ChARsoN cHing.....in the marathon this year (Feb 09), i saw a young guy vomiting right after he finished this deadly slope