front end clunking sounds over rough surfaces

Hello, The clunking could be several things. The shock mounts, front control arm bushings, or sway bar links can clunk over straight but undulating roads. It may even be the shocks, as it's hard to tell when they really go when you drive the same car for so long. You'll want to get that into a shop for proper diagnosis, especially to avoid replacing unnecessary parts! http://repairpal.com/lexus-within-10-miles-of-honolulu-hawaii-96813