Safari for solo traveller?

Hello,
Was hoping for a bit of advice here.
I've just recently become single again but have two weeks off in Sept. Me
and my girlfriend were going to go to Yosemite to go camping and hiking but
I don't really fancy doing that on my own at the moment. I was hoping for
some references to organizations or places that specialize in grouping
singles together for activity holidays. I was thinking along the lines of a
South African safari with a lot of walking and exercise included. I'm not
looking for a dating group or a Hedonism kind of place, just some way to get
away from work for two weeks, have a good holiday and a great experience.

Any pointers in the right direction to find such places/companies? Any
help would be greatly appreciated.

Cheers,
Shawn