I have been to Vietnam to both SGN & HAN, HAN is WAY more nicer then SGN, SGN is if your a Vietnam war History buff then SGN is for you, HAN is near Halong Bay which has AMAZING scenery, also try to go to Hoi An also a very beautiful city way more nicer then SGN and you can also make custom made suits and shirts in Hoi An cheaper then Thailand. if you have questions about Vietnam and surrounding countries would be more then glad to give you advice.
I was there right before chabad HAN opened up.
Perfect.
I also want to chk out the amazing cave system that was recently opened close to HAN, and I was recommened the lantern city (Hoi An) as well.
Here is the email I got from a friend w/ a short list of northern activities.
"These are the spots we loved in the northern half of country-
Hanoi (nice for a day- your hub)
Hoi An- Lantern city (specialize in tailors- could be nice for shabbat)
-I believe there are resorts and beach towns right near here where you fly into
Dong Hoi- (farms/rice paddies and cave system)
Halong Bay/Bai tu Long Bay- boat trip through the karsts)
And then there are mountain towns that are supposed to have epic hiking north of hanoi...."
And I heard about the tailoring. I'm not a suit kinda guy, but maybe s/t for the kids.
Flight from to HAN are only around $80 RT.