When Ohio resident Bill Haynes heard about the shooting at Westgate Mall by Islamic extremist gunmen last month, he considered canceling his upcoming 17-day safari to Kenya and Tanzania.

"You can't help but be concerned," said Haynes, 67. "Here's a place we're going to be in about five days and there are some terrorists shooting the place up. That would cause anybody to give some pause."

Acting on advice from a friend in Nairobi, Haynes went through with his trip except for a stop at Lamu, a coastal city near Somalia where a French woman was kidnapped in 2011.