Just returned...you are going to love it. take South African Rand as you cannot change namibian Dollars once you leave the country and be prepared for tips - when I went 100 rand note was worth £5. things are very cheap there so you won't need much. Make sure you are prepared to take lots of photos the place is amazing. Also warm during the day but you need warm cloths at night and the boat trip and early morning safari will be chilly. good shoes needed and be prepared for sand and dust. lastly enjoy great holiday
