Barbuda is practically a wildlife resort because the population density is so low. There are only a few hotels/resorts (the late Princess of Wales is said to have spent some time there). The long, sandy beaches are protected by reefs which are littered by "a few centuries' worth of shipwrecks" 
There really are no attractions of note on Barbuda - you go there for a quiet and undisturbed swim (or snorkelling, or sunbathing) - although the occasional ruin bears witness to past fighting. The highest point in the "North-Eastern Highlands" is a majestic 125 feet, but there's also a natural cave 400 feet under ground, and several sink holes of interest to tourists and botanists alike - a few plant species are reportedly world-exclusive to this little island!  The most prominent inhabitant of Barbuda is the Frigate Bird; the island is home to the largest colony in the world. There's a Nature Reserve in a lagoon not far from the airport, and while there's not really a "scheduled" boat service, local fishermen are used to ferrying tourists around that for a fixed price (which, as far as I remember, is rather high - in the region of US$ 20 per person). 

Antiguans claim to have a different beach for every day of the year and their island's many beautiful soft, sandy beaches and coves certainly constitute its main attraction. This is where people come to relax and luxuriate in clear water that sparkles under hot sun. Low-lying and volcanic in origin, Antigua & Barbuda form part of the Leeward Islands group in the northeast Caribbean and have certainly adopted the notoriously 'Caribbean' way of life: this is a place to take things easy, to stroll around markets, gulp the fresh juices of coconuts and pineapple, and to meet friendly locals with plenty of anecdotes. 

Unlikely, but should you grow weary of Antigua & Barbuda's nautically-themed activities, the area also abounds with colourful bird and insect life. Barbuda is an unspoiled natural haven for wild deer and exotic birds and boasts the Frigate Bird Sanctuary. There are also national parks and blow holes to discover, including, of course, the Devil's Bridge, a natural phenomenon crafted by the colliding of Atlantic and Caribbean surf.

Harrison's Cave
- It is believed that Harrison’s Cave is the only cave in the world where running water is found along with colour crystal-like formations. The cave has large chambers, stalagmites, stalactites, lakes, streams and waterfalls.