Clare County Council is set to spend an estimated €16.5m, including €2m on a tunnel for pedestrians, at the Cliffs of Moher.
The spend also includes a €6m upgrade on visitor centre facilities; €4m on 'admission, parking and traffic management'; €2m on Cliff Walk improvements and €2.5m on a waste water treatment plant upgrade.
The current visitor centre was designed to accommodate up to 800,000 visitors per annum and last year, a record 1.6 million paid to enter the visitor attraction.
The tender documentation says as a result, a number of items must be addressed to ensure the health and safety of all visitors in the unique environment while the Cliffs of Moher continues with its 2040 strategy.
The Cliffs 2040 strategy team is currently preparing an architectural masterplan for future development on the site for the next 20 years.