Planning for your travel to Rwanda there are several airlines coming to Rwanda and today Rwandair has direct flight from London to Rwanda.
There is also several tour operators offering best gorilla trekking safaris in the Volcanoes National Park and more safaris in other national parks like Nyungwe Forest National Park and Akagera National Park.
Also for those willing to take own visit to the Volcanoes National Park here you find several Rwanda car rental agencies offering cars based on self drive options.