Travel insurance
As still a developing country, Vietnam has several diseases, so besides bringing medicines, it’s better to buy insurance for yourself before you go, because all the medical safety advice in the world isn’t going to cover your medical bills if something does go wrong. You may refer to World Nomads for buying online.

First Aid kit
Now that you've gone to the trouble of getting yourself a whiz-bang first-aid kit, remember to actually take it with you. There's no point coming off that mountain bike at the top of the hill and realizing the bandages are all the way at the bottom. 

Overview

The Mekong Delta is the convergence of life and industry, where the agriculture and fish farming are intensively practiced. Coming here, tourists will find multi-storey rice paddies stretching to the horizon.
Not for nothing has the delta of the Mekong River been termed the "rice bowl of the Universe". Six countries and well over fifty million people depend upon the Mekong for their very livelihood. And in no country is this dependence so profound as in Vietnam.
Flying into Ho Chi Minh City (Saigon) gives as good an introduction as any to the wonders of the Mekong. From the air the landscape resembles an intricate anatomical chart, only in shades of green and brown rather than white and red. Every tributary of the Mekong River bifurcates, then trifurcates and multi-furcates into thousands of veins, arteries and capillaries. Then, linking this vast drainage network are hundreds of manmade canals, giving the countryside the appearance of an Eastern Venice…
Activities
Floating markets
Snake farms, My Tho
Long Xuyen
Cat Tien National Park
My Tho