I did the following trip during this Chinese New Year (29 January - 4 February 2006). This was my third visit to Vietnam.
D1: Night flight: HKG --> HCMC
D2: Saigon -- join local tour to Tay Ninh (Cai Dao temple) + Cu chi tunnel
D3: Saigon -- join local tour to Mekong Delta, NIGHT BUS to Nha Trang (450 km from SGN)
D4: Nha Trang sightseeing
D5: Day bus (from 0800 hrs to 1430 hrs) to Dalat, which is 220 km from Nha Trang. Rush rush sightseeing around Dalat. I took a train tour at Dalat train station. Visited Dalat market in the evening.
D6: Day bus (from 0800 hrs to 1700 hrs for 300km ride) back to Saigon. Wandered in the city centre and enjoyed the last nite in Vietnam. Went back to guesthouse and had several hrs sleep. Then got up at 0300 hrs in the early early morning to catch the flight at 0600 hrs!
D7: Home again!