Agriculture is going to be very big IMO.  Many unemployed youth might start doing agriculture becasue everyone needs to eat.  We import to much food and we have so much arable land. If we can subsidize farmers then more people will become farmers. They will help with local consumption and also consumption around the world.

Tourism is going to be big because they are building a Six Flags in Tinapa and they are building a nice museum in Badagry. http://allafrica.com/stories/200909210614.html
http://www.ngrguardiannews.com/friday_review/article01//indexn2_html?pdate=210809&ptitle=Slave%20Route%20project%20reunites%20Jacksons%20with%20their%20Badagry%20root

Also, once power gets better, textiles and manufacturing sector will get better. The factories in Nigeria will be more efficient and produce more bring more GDP and forex. many factories have moved to Ghana, but theyy might move back if the power situation is better.

Entertainment is also going to be bigger.  Nollywood is alright not but once it gets a big investment to make huge movies with the best actors/actresses then it will be huge.  Sports may get bigger and bigger as well. There is a big market for soccer, too many people watch English football instead of Nigerian. So if there are better players then it can get better.

Which industires do you think will boom in Nigeria over the next 5 years?

good info, i'm thinking about what to go into as well,