You will probably not doing any camping or much of outdoor activities here except probably a visit to the Atlantic Ocean facing beach.
Some beach wear will be useful if a beach visit is in your itinery. Don't have to carry your surf board, sails, etc though as it might be difficult for you to clear the customs in the airport. You can rent one of those at the beach if you really into it.
A digital camera will come in very handy in Lagos. Typical SLR camera will also do the job except that developing the phtotos is not recommended locally. Conventional photo shop is not easily accessable. Quality is poor too.
Cautions: Before you take a shot, make sure you have asked for consensus from the owner/local otherwise they can get really offended.
Toiletries and Medical Supplies:
As mentioned in my main page, you have to make sure that you have all the necessay vaccinations taken, for examples Yellow fever, Tetanus, Polio, Hepatitis A&B, Meningitis A&C and Typhoid. Medical facilities are very poor locally and very expensive if you can find one. Bring some basic medication kits Paracetamol, Flu tablets, cough mixture, insect repellent, bandages etc.
Nigeria is categoried as one of the high risk malaria countries. It is important that you take anti-malaria tablets 4 weeks before the visit and continue the prescription for another 4 weeks after you left the location.
Symptoms of malaria may include fever, chills, sweating, weakness, aches and pains, abdominal pains, diarrhea or vomiting. These symptoms are called "nonspecific" because they are not exclusively caused by malaria and are similar to those of the flu. If you experience some of these symptoms in the weeks following your recent stay in a high-malaria-risk country, "think malaria first" and see a doctor asap.
Lagos has tropical climate all year round.
If you are on leisure visit, bring summer clothing and casual wear. Humidity is high all year round and can get real sticky when standing under the sun. It is recommended that thin T-Shirts, Khakis, sandal will be just fine here.
However, if you are here on business. Though the weather can be really hot, the locals business community are usually very well dress with ties and suits or jackets. It is important to dress well if you are after the business when approaching a local organisation otherwise, you will not be entertained.
Luggage and bags:
Most airlines from Europe into Lagos allows baggage limit up to 65kg per passenger. This is mainly due to request from local passengers who usually do BIG shopping from London, Paris, etc.
The baggage handling in Lagos Airport is known to be poor. Extra attention needed when packing your stuffs. Lagos International Airport was once filmed by National Geograhic Channel as world's most dangerous airport.
It is recommended that you travel with strong hard case luggage with locks on each edge of the bad. Canvas luggage are usually been broken into by sharp objects while it is in tarmac.
Put extra locks or luggage crossover belt if you are carrying heavy stuffs.