Mekong Delta cruise
Aqua Expedition Mekong delta is outstanding. Delivers everything it promises. The guides are extremely smart and knowledgeable about history, nature, politics, geography and more. All the staff are wonderfully obliging and sweet.
We booked the 7 day upriver cruise (from Vietnam to Cambodia) and we were glad we did as Cambodia is much less populated and more unspoiled than the Vietnam section of the delta so this way the trip just got better and better. It ended at Siem Reap (a few minutes from Angkor Wat) which is a highlight in itself. The 7 day cruises can only be taken for the few months that the water is high enough to reach Siem Reap. Early October seems to be the safest and best time. Note that the weather is very hot and humid so wear extremely light clothes. Also note though that you will need to have your shoulders covered and have shorts to your knees when visiting temples.
In terms of cabins, if departing from Ho Chin Min City, the East facing side of the boat is probably better than the west side because of the afternoon sun. We had the west side and by early afternoon it was way too sunny and hot to sit on our balcony.