I haven't done a ride more than 180km but here's what I have learnt for afterwards.

Make sure you prepared for after the ride beforehand. Mix a recovery drink up, have your loose clothing laid out and compression tights. Also have a selection of snacks in case you just cannot go out or face a meal.

Look into if a spa, pool etc is available- I used to love a soak in the pool after a full day of hot, sweaty riding.

Elevate your legs (if you have compression tights just putting a pillow under them will really help).

I find a massage the day afterwards is the best. They really can only do a light rub at the tents on the finish line if they have them.