The landmark will only be able to have 1000 visitors a day rather than the usual 10,000.
Half-price meals will run at participating restaurants from Mondays to Wednesdays next month.
The tourism and hospitality sector has been asked to prepare for reopening on July 15.
The Scottish Government is hoping to move to 'phase three' of its plan to exit lockdown in July.
Anika and Andreas Schulz' plight comes as a leading economist warned many job losses could become permanent.
Industry leaders say loss of coach firms could jeopardise tourism in the region.
Owners of the Coylumbridge Hotel in Aviemore, blamed the notice on an 'administrative error'.
Trees for Life will establish the centre on a 10,000-acre estate in the Highlands after receiving more than £2m in funding.
The Corrieshalloch Gorge National Nature Reserve is situated in Wester Ross.