A Dunedin charity leader is preparing to pound the pavement from dawn until dusk to shine a spotlight on sexual assault prevention. Red Frogs New Zealand national director Raymond Thomson plans to walk the length of John Wilson Ocean Dr continuously on Saturday, May 23. The effort is part of the Red Frogs Longest Walk Home, a nationwide fundraiser that encourages participants to devise a walking, running or cycling charity challenge and help raise money for sexual assault awareness and prevention. Red Frogs New Zealand has spent nearly two decades safeguarding young people in environments where alcohol or drugs might be present such as New Year’s parties or student bashes. Volunteers act as eyes and ears, offering assistance and accompanying the vulnerable to escort them to safety. ‘‘One of the things that we do is we ensure safe spaces at unusual times and over a long period of time,’’ Mr Thomson said.…