Originally Posted by plunet

OK, so this is how it all happened.

QR833 from Bangkok tipped out into the Departures area on Level 1 (we didn't need to clear transit security, which having had to clear it on our outbound transit seemed to be a complete waste of time and an unnecessary scrum, even as a J passenger). We had almost 10 hours in transit before QR175 departed for OSL.

As a J passenger we wanted to leave our bags in the lounge lockers before heading into Doha for a couple of hours to just have a quick look around and use the transit visas we had applied for and got (after some faffing around with the quality of the scanned passport image).

We headed from our arrival gate along to the main concourse and up the escalators to the Al Mourjan Business Lounge on Level 3. Heading right as we entered the lounge and the room where the lockers is just next to the entrance. We found a staff member in the locker room who will allocate you a locker and give you a locker number tag as well as recording your onward flight details. Probably best not to mention that you plan to leave the airport (see NOTE below).

What you will need:
Your passport
A copy of the transit visa as a printout (but it's probably not needed)
Your boarding passes
Some QAR money - an absolute minimum of QAR80 to get to/from the Souq

Might be useful:
Your phone with some offline maps installed (maps.me works well)

From there you now need to get back to Arrivals, and this is the bit that is not signposted. But what you need to do is go to Level 2 - exit the Lounge and take the Lift (not the escalator) down to Level 2, where you will be arriving on the output side of transit security. Here you need to speak to someone and explain that you wish to go through to arrivals - you effectively need to walk through the transit security scanners the wrong way (against the flow of people) so just speak to someone as you do this.

From the other side of the transit security scanners, head to the left, along the corridor, and now follow the signs for Arrivals.

In the Arrivals area, continue past the bulk of the immigration counters to follow the signs (if you are a J passenger) for the First and Business Class Lounge at the far left of the immigration hall. Show your arrival boarding pass to get into the arrivals lounge, and proceed directly to the dedicated premium immigration counters on the far side of the lounge.

The immigration agent didn't need or ignored the printout of the transit visa, he just processed our passports and I assume found the transit visa from that. Although the rules state that you should present a printout of the transit visa, it seems that in practice that it's not needed.

Once through immigration you can then walk through baggage and customs into the Arrivals area. Follow the signs for the Taxi rank (from memory to the left). The whole process took about an hour, and that included time for us to faff around as we didn't really know what we were doing and it took us time to get the right answers that we needed to walk the wrong way through transit security.

The taxi downtown will be QAR25 Flagfall plus the distance to down, and to the Souq Waqif this ran to a total of QR50 for us, and took no more than 15 minutes. From there it was easy enough to meander through the Souq and watch life go by and snap a few pics. As @N1rotate suggested, from there we continued to wander over to the waterfront and up to the Museum of Islamic Arts - the hardest part of this was crossing the busy road that runs along the waterfront, we had to wait several minutes for the pedestrian crossing to change. If you're wandering around after midnight, be careful if you want to wander across grassed areas as the irrigation systems turn themselves on with no warning and you might get a free shower.

By this stage it was heading for 1am (and our bodies thought it was 4am) and we decided that the view of the corniche across the bay was enough, so we just picked up a cab and headed back to the airport. Cabs were plentiful, we had many optimistically slow down to pick us up whilst we wandered around, and it was no issue getting a cab.

The cost of the taxi back to the airport was QAR28 - flagfall downtown is QAR4 hence the return journey is cheaper. I would guess that a taxi from the Souq up to the corniche would have been less than QAR10. We had cash available to pay for the taxis.

Back at the airport, it was a breeze to get back in. The taxi dropped us off at Area 1 for Business/First, we wandered through a deserted check in area (which looked more like a 5* hotel lobby) straight to immigration. The single officer on duty just scanned our passports, checked our onward boarding pass, and gave us our exit stamps, we just had our mobile phones to put through the security scanner, and we headed back to the main concourse and up to the Al Mourjan Business Lounge. A few hours kip in the Quiet Room, and we had a very pleasant transit in Doha.

NOTE: Whilst working out that we needed to go through transit security the wrong way to get back to Arrivals, we spoke to a few people. One of those people, a lounge dragon at the bottom of the escalator to the Al Mourjan, insisted that we could not leave the airport because we had left our hand luggage in the lounge lockers. She understood exactly what we were doing, and knew about the transit visa, and was very insistent that we could not do what we were trying to do as it would be a security violation. We did press the point with her a couple of times asking why security cleared hand luggage presented any security issue, but she was insistent. But as is often the case in these parts of the world, we thanked her for advice, and went off and asked someone else out of her sight and got the right answer.

Hope this is useful to others contemplating their own DIY Transit Tour of Doha when the QR stopover city tour is not running or oversubscribed.