There is a really nice wreck for a beach dive near Honiara. It is a very large Japanese troop carrier that got beached during the battle. I can't remember it's name. The bow is sticking up slightly out of the water, just off the beach. The stern is very deep, like around 200 feet and the ship is huge. It is still discharging oil and it is heavily encrusted with lush coral and there are a lot of fish of varying sizes. Check tides as there can be some surf on entry or exit. Very worthwhile dive. There are a few other sites as well including an airplane but the ship is so large that you could dive on it for several days. Topside, the island has some interesting leftovers from WWII. Prepared for mosquitoes and be aware that the Solomons are a hotspot for malaria. Have fun!