Having had a look at your site, it is all about visibility.
Are you targeting foreign markets? If so, what market? US, EU? If so, what markets within those markets are you focusing on?
Are you targeting the Irish market? How do you plan on spreading the word?
It is very difficult to get into B2C internet marketing without including within your business plan a budget for adwords, SEO and social media activity.
Maybe not what you want to hear.
However in saying that....
It boils down to your business plan and what your growth goals are.
Perhaps developing relationships with some organisations, become their preferred search site.
Perhaps spend a bit of time contributing to travel forums where you can point to your site.
Perhaps promote your site through Facebook and Twitter with competitions and surveys.
Perhaps blog and distribute your posts to relevant sites.
The bottom line is that although a budget may be required for growth on a larger scale, you can supplement your core marketing activities with other zero cost activities to help drive traffic to your site.