I just been Penang.
Just some info to share to all.
Taking Rapid Penang Bus Service is convenient & easy in Penang than KL.
I take
Bus No. 401E from Airport to Komtar. As informed
Bus No. 102 also go Komtar.
From Komtar, I'm try walking to find Khoo Kongsi, unfortunately, it's like a mazed in that area, back & fourth couldn't find it.
Found one but not Khoo Kongsi though
In the end, some one guide us again, i give up though cause need walk again back few road.
So we continue go through Jetty, then to Swetteham Pier, that where I need go.
So, we are walking from
KOMTAR to
SWETTEHAM PIER and carrying our luggage too, damn hot sun too.
When back from Swetteham Pier, we took Trishaw to JETTY, fares RM10, but we pay him RM20.
Then we took Bus No. 401E from JETTY to QUEENSBAY MALL, fares RM2.00 per person.
Around 4pm, we take QUEENSBAY MALL to AIRPORT, fares RM1.40 per person.
Very Easy, just ask Driver

Very interesting adventure. Maybe you could visit Penang again some other time.