It's small enough to scale on foot if you like to walk, otherwise there's plenty of Petit Taxis around to take you where you want to go.
There are some beaches around town.
There's a pizzeria called Bella Italia on the Avenue F.Ar.N #158 (0536606662) which has good pizzas.
Riad Dar Nador. It's a bit of a splurge, and about 1 km from the city center. But this newly opened (Oct 2015) riad offers
A local bus (green) can also take you to Beni Ansar for 4 MAD (Dec 2015). A shared taxi heading there will set you back 6 MAD. There's a bus station near the city center, about 3 blocks from the beach, connecting Nador to various other destinations like Fez (about 5 hours) and Berkane (1.5 hours, 20 MAD).