I thought for park buses dropping off Kidani (where Sanaa is) was the first stop - in any event, the bus driver will say "Kidani" when he stops. If you inadvertently find yourself at Jambo rather than Kidani it's about a 10 minute walk between the two - or there's rumored to be a van that drives people between the two as well. Jambo is worth a stop on it's own just to see the beautiful lobby and the large gift shop is nice IMO. There is no way to walk from AK to AKL that I know of - so a bus is a must. Lots of people go to AKL for dinner after AK, so the bus might be a tad crowded, but it's a really quick trip.