Yes, however it will not be possible for you to play them within your stateroom.
For bagpipes, it would be preferable if you use a chanter to practice on.
It will be possible for you to play them in a show lounge or other such room from time to time pending that no shows or activities are scheduled there, and only between the hours of 10am and 10pm.
Please contact the Voyage Director when you embark and they will be able to advise you on which venues and what times would be most suitable for your practicing. Please be aware that there may on occasion not be a location available to you.
Please note that your instrument will contribute to your luggage allowance where applicable and should be stored in your cabin.