Whether you're supporting someone or just there for the atmosphere it pays to have a strategy to catch the best piece of the action. Here's a basic guide on the best views for the race on 25 April.
Look out for the riverside pubs in Narrow Street, Limehouse.
Blackheath & Greenwich Park
The advantage of being at the start is that you'll be able to hear the starter's pistol and see the runners at their best - fresh-faced and full of energy - and the excitement in the air will be palpable.
But your cheers of encouragement will not play the crucial role they could at a later stage of the race - and the chances of spotting your friend in the pack as the runners pour by are slim at best.
Cutty Sark & Greenwich
Greenwich, a great place to watch the runners and explore after.
Due to restoration work on the Cutty Sark clipper, access to the area will be severely limited this year. Spectator viewing opportunities are greatly reduced and you are advised to avoid the area.
The town centre does get very busy on marathon day although there are plenty of opportunities to watch the marathon either side of Greenwich town centre towards Deptford or Charlton.
It will be very difficult to access the Greenwich Foot Tunnel if you are coming from Greenwich Park and most spectators will be guided to Greenwich DLR Station, five minutes walk from the town centre.
After the runners go by Greenwich offers a place rich in history for you to explore. The National Maritime Museum, Royal Observatory, Old Naval College and Greenwich Market are just some of the places to visit.
Another point on the course where you can see the runners twice - once as they cross the bridge after 12 miles, and again as they come back past the Tower of London after 22 miles.
Tower Bridge - where you can see the runners twice.
Most runners should get to Tower Bridge without a problem, but the 12-mile point is where a shout of encouragement will begin to make a difference.
By the time they reach 22 miles, they'll need every little piece of help you can give them. The legs will be almost dead for most runners - this is the point where the body has used up pretty much all of its available carbohydrate resources.
Here you can watch the runners make their way from Tower Bridge through to Limehouse and the
The Grapes, Narrow Street. The runners go past this riverside pub.
Isle of Dogs. Look out for the historic riverside pubs in Narrow Street, Limehouse!
Around West Ferry, East Ferry and Marsh Wall on the Isle of Dogs you can get great views as the crowds begin to thin out. It's here that you'll get the best chance of being right at the front for a close-up look at the front runners or famous faces.
Because of the way the course loops around Canary Wharf, you can also catch the runners twice without having to walk very far.
This long road has plenty of space to watch with the added bonus of the route passing twice.
The Highway also marks the halfway point of the London Marathon.
With 23 miles gone, the runners will be hurting. But they'll also be spread right out and going about as slowly as they will at any stage in the entire race, so spotting your pal shouldn't be a problem.
Not that you should keep your cheers reserved for the people you know - many runners will be going through hell at this stage.
The Mall - the final leg of the London Marathon.
Everyone's smiling at this point - it's the end of the road.
Great scenery while you watch the tired runners go by - you've got Buckingham Palace in the foreground and the Houses of Parliament in the background - means there's no mistaking which marathon this is you're watching.
For more places to watch and recommended pubs along the route visit the official website's