You know I love BOG. It is a shame you don't have 1-2 days lay over because BOG can be a fun city to just go and explore.
It's actualy fairly safe if you use common sense. There is a good bit of shopping and some nice museums to be seen. Prices are fairly reasonable and far cheaper than in CCS.
When I do only connect in BOG and have 4-5 hours I will leave my bags at the airport in storage and go to one of the nearby malls and just look around stretch my legs and get some decient food.
Taxis are dirt cheap so it runs me about $5.00 each way, with about $6-7.00 for a good meal! Also i've allways avoided the Airport tax when only leaving a few hours latter.