Umm Al Quwain is a very compact emirate, you can go around it on foot. Umm Al Quwain has nice beaches, camel races, Dreamland Aqua Park, shooting club, historical and architectural sights - it attracts tourists from all over the world.
It is also famous for the Sea Research Center, which is constructed from coral stones and is the earliest architectural achievement. Academy of horse riding is also famous here.
From here you can make an excursion to Al Siyar, there are lots of sea birds.