Assateague Island is a great vacation spot! Its even great for just a weekend away from the house if you live nearby. It is just minutes away from Ocean City, where there is tons to do! But perhaps the most appealing aspect of the island is the wildlife.
Aside from the not so unusual deer, rabbits, squirrels, etc., the island has many wild HORSES! They are frequently on the road as soon as you cross the bridge to the island, and you'll even spot them on the beach from time to time. If you're lucky, you may see some dolphins playing not too far off in the distance while you're relaxing on the beach.
The island is divded into a state park and a national park. Both offer areas to play on the beach, and both have campgrounds. Camping in the state park will cost you $30 a night, while the national park is just $20 a night. There are campgrounds on both the oceanside and bayside of the national park. The oceanside campsites are great because you are literally just a sand dune away from the beach. The national park also offers an offroad section (of the beach) that requires a permit.
The island is also very popular for bicycling and horse riding (not the wild horses of course).
If you're looking to spend some time outdoors, maybe go surf fishing or camping, Assateague is a great, relaxing place to do it!