It's great that you're thinking of visiting us, and I'd be more than happy to answer your question. :)
As the VAT reclaim is only applicable to goods, you can't reclaim it on services like hotels, restaurants and attraction fees. As a visitor to Ireland who lives outside of the EU, you are entitled to claim back a portion of the VAT on purchases made during your stay. This goes for both the Republic of Ireland and Northern Ireland (UK). Most retailers participate in the VAT refund scheme, so make sure to ask for a VAT refund form in the store where you're making your purchase.
For more information on customs and VAT refunds on the island of Ireland, take a look here