If you can try to walk right after the race. I swear by movement heals. Cool shower or bath to help inflammation. Drink plenty of fluids to rehydrate, A secret meal is Vietnamese Pho soup, a great combination of fluids, sodium, protein and carbohydrates. The next few day light cardio if you can. Be prepared for DOMS (Delayed Muscle Onset Soreness). A deep tissue massage is well deserved!