We are proposing a southern route onto the Shotley peninsula as well, although this is currently being thwarted by a poor surface through Cutlers Wood in Freston which carries an SSSI rating . This page details some maps and diagrams:
Ipswich cycle map (part of) and showing suggested walk section.
A14 junction 56 crossing via A137
A14 junction 56 crossing – Google Earth
A14 junction 56 – Google Map Link