Vietnam breaks down to two regions, north and south divided by the 17 parallel (DMZ), the north has a climate like France....the south is tropical- hot and in june will be very sticky indeed. I suggest flying into Hanoi if possible. Folk usually tour north-south or south north....so you may find people like yourself travelling the same direction.
Halong bay.... splendid views
sapa minority town near fansipan the tallest mt if thats your thing
Hanoi... class town
hue... just gorgeous, surrounding areas class too, tours to Dmz etc here.
hoi an.... get cheep suits
Nga Thrang...party town, cool around and try the boat trip...mad hatter!!!!
dalat cool in temp`, plenty of waterfalls around...rent a scoooter.
Ho Chi Minh...museums,pagodas 3-4 days
mekong delta...can tour from ho chi....
Some huge cave networks in some of their 15 national parks, mui ne is nice by the coast.
Practice some Viet phonetically and it s easy...... most locals thought i was fluent.... just ask and i ll write some if you need any Blue.....Enjoy!