I notice plump, green miniature apples gathered in a shallow gully by the side of the path. Resort guests are strongly warned to avoid this tempting, poisonous fruit; its parent tree, the manchineel, has sap that can blister the skin. Giving the scrubby trees wide berth, I head for Marni Hill, one of several high points on this craggy volcanic island. Parts of the hike are steep, and today -- like most days in the Grenadines -- the temperature stays near 80 degrees. All around, tall grass and wind-blown brush are sketched in charcoal and beige, punctuated by slashes of vibrant green: giant cactuses towering 10 feet high. At the end of dry season, every fiber of this evocative landscape yearns for the coming downpour. I sip from my water bottle and drink in the Marni Hill view of Petit Martinique, less than a mile away. I imagine women peering back at me, looking out from the small homes that cling to its rugged hillsides. Many of them wait for husbands, sons or daughters to return from jobs on Petit St. Vincent -- jobs many have held for decades, even generations. Strangely enough, these sister islands belong officially to separate nations: Petit Martinique is the northernmost member of Grenada's three-island nation, and Petit St. Vincent the most southern of St. Vincent's island group.