Is it possible to export reservations to csv or other formats ?
Modern tours allows to export list of reservations to CSV format.
With excel or other software you can easily convert csv to xls, xml and other formats.
Where I can change text for front end or back end elements ?
All text strings can be changed through language files, path for front end: /language/en-GB/en-GB.com_modern_tours.ini
Back end path is: /administrator/language/en-GB/en-GB.com_modern_tours.ini
I don't want to use payments, can I disable them ?
Yes, reservations can be made without redirecting user to payment page.
Can user cancel his own reservations?
Can I disable specific days ?
Modern tours allows you to disable days based on date and weekday.
For instance you can completely disable reservation for every Monday, Tuesday, etc. or dates like 2018-10-05, 2018-10-06, etc.}