You've just crossed the finish line to complete the marathon but your work doesn't stop there. Your road to recovery starts now!
If you can try to elevate your legs. This will help to reduce the fluid build up in your legs and is a particularly important step if you are an injury prone runner.
Nutrition wise, it is essential to replenish your depleted energy stores which your body will have used up during the course of the race. Be sure to take in sufficient water and carbohydrates.
It probably goes without saying but don't overwork yourself too soon as this would only slow down your recovery. Prioritise getting plenty of sleep and rest. Exercising in water is low impact and will not be further depleting the enegry stores in your legs. The water pressure helps to remove the waste products and extra fluid built up in your legs from running in the marathon.
And if you really want to treat yourself a sports massage would always go down well.