Hobo Advice

Start your trip in Dublin, but make sure you get out of the city at some point and see the rest of the country. Go to a local pub, away from the main tourist sites (believe me, it is infinitely better), but make sure the bartender doesn't try to rip you off, which unfortunately happens pretty frequently to visitors. 5 euro tops for a pint, and order a Kilkenny if you can. It's even better than Guinness in my opinion. Other than that, travel across the country, see cities like Cork and Galway, and if you have time, spend a night is a small town or village. Most of all though, talk to as many people as you can. In my short time there and despite my slightly awkward mannerisms, I had more conversations and meaningful interactions than I could count.

Overall Impression

Everything really is green here
Traditional Irish music is awesome
You can strike up a conversation with practically anyone at any time
It rains a lot
Kilkenny beer tastes better than Guinness
Choose a pub with locals instead of tourists (believe me, it is much better)
Temple Bar can be fun, but is really expensive
People are friendly everywhere but expecially in the country
The food is at least significantly better than English food
Soda bread is delicious
Glasnevin is the coolest cemetery in the world