02139 , telephone -lrb- 800 -rrb- 221-0814 , and adventure center , 5540-a college ave. , oakland 94618 , telephone -lrb- 800 -rrb- 227-8747 or -lrb- 415 -rrb- 654-1879 , offer kilimanjaro as a seven-day adjunct to their african safaris .