Ah, okay.
So, the Zhentarim normally does sneaky-illegal stuff, so maybe when they start the caravan, the characters that are a member of the Zhentarim needs to smuggle some illegal substances to their destination. They get 1 renown upon completing this, and are given 50 gp each.
The Harpers recently discovered a historical trinket in [insert ruinous location] and need the characters to deliver it to a scholar in their ranks who will know the meaning of it. They get 1 renown for completing this, and are granted a favor.
The Lord's Alliance has a letter you need to deliver. This could be from one of the Dukes of Baldur's Gate, and you must not open it. If they open it, they get nothing, and lose 3 renown. If they don't, and deliver it, they get 1 renown.
The Order of the Gauntlet has discovered a cult in [insert location here], which is on the path for the caravan. They just need to go there, learn about it or disband it. If they learn and report it, they gain 10 gp and 1 renown. If they destroy the cult, they gain 25 gp each and a weapon of their choice, and 3 renown.
The Emerald Enclave discovered a few members of [insert endangered species] in [insert forest] and need the characters to learn about them, and capture them in order to breed more of the species. For the notes, they gain 1 renown. For 2 specimens of the species, one male one female, they get an additional renown and 20 gp each.
Any of these help? I might post later with later quests.