#1
So me and a friend are going to be playing acoustic guitar + bass songs at a local farmer's market for some extra $$$. Any suggestions for songs? So far we have some originals, plus Listen to the Music by the Doobie Brothers, and Under the Bridge by the RHCP. All songs will be played instrumental
#2
banana pancakes - jack johnson

Edit: just saw the instrumental part. it would probably still work, you'd just need to add a melody line on the guitar or bass to make it more interesting
#3
Well, I like "Ballad of the Baconsfield Miners" by the Foo. It's pretty simple and its repeats over and over so you could stretch it out. However, there are two guitar parts, and I don't know if your bassist would play a little rhythm guitar also. You could also try some Zeppelin, most of their acoustic stuff would probably hold its own as an instrumental. "Over the Hills and Far Away" is a good one.
My Gear:

MIM Fat Strat
Ibanez V70CE
Epiphone S-210
Danelectro '59 Factory Spec Reissue
Godin 5th Ave Kingpin

Fender Hot Rod Deluxe (x2)
Crybaby 535Q Wah
Marshall Regenerator
EHX Little Big Muff
BBE "Supa-Charger" Power Supply