The Inverness Castle Viewpoint has drawn more than 29,000 visitors since it opened a year ago.
Operator High Life Highland s(HLH) said the attraction – which gives 360-degree views of Inverness and beyond – is now back to opening seven days a week instead of the four-day winter schedule.
The tower will be open from 11am to 6pm in April and May and 10am to 7pm througout June, July and August.
Inverness Provost councillor Helen Carmichael said: “As we can see from the number of people who have visited, the Inverness Castle Viewpoint is a great additional attraction for visitors to the city as well as Highland residents.
“With fantastic 360 degree views of the Highland capital and the spectacular scenery of the surrounding area, the viewpoint is becoming a must-do for everyone visiting the city.”
In February, the viewpoint attracted more than 2,200 people after HLH decided to run two open weekends to allow more people to enjoy the view from the top of the tower, and help as part of any New Year resolutions to keep fit.
More than 5,000 people visited the attraction in July last year alone.
The viewing platform is part of wider plans to turn Inverness Castle into a tourist attraction of “national significance” which Stuart Black, Highland Council’s director of development and infrastructure, said previously could become the “V&A of the north”.
The council boss hopes to furnish the new tourism centre with artefacts from across the Highlands in a bid to encourage tourists to travel farther afield.
At present the main castle building solely serves as the city’s courthouse, but the court service will move into the new justice centre in the city’s Longman Road next year.
A total of £15million from the City Region Deal will be used to convert the castle.
The hope is to fully open the castle as a tourist attraction in the early part of next decade.