The tin whistle is a traditional Irish instrument. It is a fairly simple to learn but perhaps less simple to master. This whistle would make a fun Irish souvenir but is also a proper musicial instrument. It is made from aluminium in the key of D. It is specifically designed to effortlessly create a sweet melodic tone. 
Good Craic stocks a wide range of Irish souvenirs including many items you may not see elsewhere. I personally select the very coolest items from the various suppliers. The shop is eclectic and fun and definitely worth a visit if you are in the Mourne area. If a product doesn’t exist yet I might just create it myself.