As a Nigeria citizen and holder of Nigeria Passport , you are free to visit certain countries without worrying about visa issues because these countries do not require a visa upon entry_as long as you have your passport

AFRICA COUNTRIES
Benin Republic (visa free)
Burkina Faso (visa Free)
Burundi (visa on arrival for 30days)
Cape Verde (visa on arrival )
Cameroon (visa free)
Chad (visa free )
Comoros Island(visa on arrival )
cote d Ivoire (visa free)
Djibouti (visa on arrival)
Gambia visa free for 90days)
Ghana (visa free)
Guinea (visa free)
Guinea Bissau visa free for 90days)
Kenya (visa on arrival for 90days)
Liberia (visa free)
Madagascar visa on arrival for 90days)
Maldives(visa on arrival for 30days)
Mali visa free)
Mauritania(visa on arrival)
Mauritius(visa free for 90days)
Mozambique(visa free for 30days
Niger republic (visa free)
Senegal (visa free)
Seychelles(visitors permit on arrival for 1month)
Sierra Leone (visa free)
Somalia (visa on arrival)
Tanzania(visa on arrival)
Togo (Visa free)
Uganda(visa on arrival)

AMERICAN COUNTRIES

Barbados (visa free for 6months)
Dominica(visa free for 21days)
Haiti(visa free for 3months )

ASIAN COUNTRIES

Iran (visa on arrival)
Sri Lanka(electronic travel authorization)
Timor-lest e(visa on arrival for 30days)
Bangladesh(visa on arrival)

OCEANIAN COUNTRIES

Micronesia visa free for 30days
Nauru (visa on arrival)
Vanuatu (visa free for 30days)
Palau (visa on arrival for 90days)
Tuvalu(visa on arrival for 30days)
Samoa(entry permit on arrival for 60days)
Fiji(visa free for 4months)

http://nigeriacamera.net/visa-free-countries-with-nigeria-passport/