While not as bad as neighboring Papua New Guinea, crime rates in the Solomon Islands are high. Travel after dark is dangerous, especially in Honiara, and muggers have been known to target tourists at the Japanese War Memorial on Mt Austin even in broad daylight.
Ethnic tension between Guales residents of Guadalcanals and Malaitans, as well as between everybody and the Chinese, continue to simmer. Australian troops have been in place since 2003 to keep things in check, but this did not prevent violent rioting in Honiara in 2006 from destroying large parts of the city.
Malaria is the biggest health issue in the Solomon Islands. Travellers to the area should take anti-malarial pills before, during and after their stay.
Saltwater Crocodiles are relatively common in comparison to other islands in the South Pacific in the Solomon Islands and great care should be taken while in or near ANY body of water. Knowledge is the best defense for yourself and for the protection of the crocs themselves. While by no means anywhere even close to crocodile levels in both Northern Australia and New Guinea, the population is still considered relatively healthy on the Solomons in comparison to much of the species' Southeast Asian range. This is especially true of the islands closest to New Guinea, which hold the highest populations in the Solomons.