All of our suggestions about keywords have one thing in common. Keywords need to be relevant for each page of your website. And they should also mirror the words that link to your website.
So, for example, words related to rooms should feature on your accommodation page, and words associated with food should feature on your restaurant page.
Also, if inbound links use keywords for a descriptive link to your website (instead of just the web address), then this improves the SEO. For example, the term "Self Catering Donegal", plus the website, "http:/www.donegalselfcatering.ie".