It's a tricky one,
I'd love to go to;
1. Borneo/Sumatra and see Orang-outangs in the wild while I still can.
2. New Zealand, My wife has been and loved it, I'd love to travel around and just chill there for a while.
3. Peru, to see Machu Picchu.
I've been to quite a few places already, I've been very lucky.
Places I've been to that I'd like to go back to and see more of;
1. Canada, I spent time near Edmonton in Alberta, I'd like to go back and have a better look around, maybe drop in on Mors
2. Australia, I'd like to see the eastern side, I only spent time in the west around Perth, and there is plenty more to see.
3. South Africa, I'd like to get past Cape Town. Its an abiding regret that I didn't see more of SA while I was there, I had the chance of an indefinite free stay at someone's beach house up the coast from Cape Town, but I couldn't take them up on the offer as I had to fly back for my sisters wedding.