Relocating to Angola with two teenagers

I would really appreciate any insights from those who moved to Luanda with children of 'high/senior school' age.  Are there recreational activities for them, can they go to the movies, go out to eat, make friends easily?  What about LIS, is it the only English international school?  I have a 17 year old son and a 12 year old daughter, and we shall be moving to Luanda from the UK in a couple of months.  Any information regarding children of this age in Luanda would be most welcome, as we are undecided about letting them board in a UK school, or taking them with us to Luanda.  Thanks!