On the first day of your trek, you probably will arrive by morning flight from Kathmandu and start immediately walking towards Phakding, mostly downhill.
Don’t miss to watch arriving and departing airplanes at Lukla airport, that is literally exciting.
There are several cafés and restaurants in Lukla where you can enjoy food and drinks. Don’t forget to visit the monastery to watch the ceremonies and get free tea provided by the monks. On the way back you may find more time to explore Lukla.