Suggested Hotels

O'Callaghan Hotel - http://www.ocallaghanhotels.com/about.html
Trinity Capital Hotel - http://www.trinitycapitalhotel.com/en/

Getting from the Airport to Trinity College Dublin

Via Aircoach - It is recommended to get the Air Coach which stops right outside the University. It costs ~7euro for a single journey. The journey takes approximately 30mins, see http://www.aircoach.ie/ for more details.
Via Taxi - A taxi will take approximately 30 minutes, the cost is ~26euro to get from the Airport to Trinity College Dublin.
Via Public Transport (Bus)
- The Dublin Bus Airlink Service (bus number 747) connects Dublin Airport to several locations in Dublin City Centre -- see http://www.dublinbus.ie/Your-Journey1/Timetables/Airport-Services/ The cost is 6euro single or 10euro return. The service brochure lists the accommodation close to each stop -- see http://www.dublinbus.ie/PageFiles/110/AirportExpressBrochure.pdf
- The 16 bus leaves the airport and will bring you to the city centre close to the University, it takes approximately 45mins, the cost is ~3euro -- see http://dublinbus.ie/en/RTPI/Sources-of-Real-Time-Information/?searchtype=route&searchquery=16
If you wish to plan your own route via public transport please see http://hittheroad.ie/

Note about Dublin Bus: This transport system does not give change to customers, so have loose change for the bus. Exact fares are to be paid on the Dublin Bus network!

Locations

A map of the other locations mentioned here, and some additional useful locations, is available at http://goo.gl/maps/181CV.

Hydra Camp

North Training Room, Berkeley Library, Basement, Trinity College Dublin, Dublin 2.

http://www.tcd.ie/Library/maps-floorplans/berkeley/Berkeley%20-%2000%20-%20Basement.pdf (other maps of the library are here http://www.tcd.ie/Library/maps-floorplans/berkeley/)
http://www.tcd.ie/Maps/map.php?b=55

Hydra Symposium

Swift Lecture Theatre Room 2041A, Arts Building, Trinity College Dublin, Dublin 2.

Restaurants

The Science Gallery has a small cafe/restaurant where you can buy a variety of sandwiches and salads. You can see the menu at http://sciencegallery.com/files/CafeMenu.pdf.

There are also many pubs and restaurants serving reasonably priced food in the vicinity of Trinity College. A list of on-campus restaurants and cafes can be found at http://www.tcd.ie/catering/StaffandStudentOutlets/index.php, while some nearby options include:

The Lombard Pub http://www.thesmithgroup.ie/thelombard/food.html (€)
Cafe di Napoli http://www.napoli.ie/restaurant/ (€€).
Wagamama Noodles - http://www.wagamama.ie/locations/showlocation/610/
The Port House - tapas - http://porthouse.ie/index.php/location/
The Green Hen (€€) - http://www.greenhen.ie/site/contact-us
Yamamori - http://www.yamamorisushi.ie/info/

More options can be found at http://www.menupages.ie/search/results/Dublin.

Lunch Options

As well as the above, the following are nearby for lunches:

http://www.nationalgallery.ie/planavisit/Facilities/Cafe_and_Restaurant.aspx
http://kcpeaches.com/index.php/menucard/ on Nassau Street (http://bit.ly/10JymWB), for salads/sandwiches.
https://www.facebook.com/Lemon.Crepe.Coffee Crepes, Omlettes, Waffles, eat in or take away.
http://mamasrevenge.weebly.com/ 12 Leinster St Sth for Burritos
http://www.cornucopia.ie/contact/ Vegetarian food (off Grafton Street, so a bit further away).

Traditional Irish Music

The following pubs play traditional Irish music nightly and also serve Irish food and good beer :)

http://www.gogartys.ie/ (nearby with good Irish music every night)
http://www.brazenhead.com/ (oldest pub in Dublin)
http://www.arlington.ie/irish-dancing-dublin.html (quite touristy, but if you would like to see Irish dancing this is your best bet!)

For up-to-date information on traditional Irish music sessions and other gigs check http://www.dublinsessions.ie/home.html

Other recommended pubs include

http://www.porterhousebrewco.com/ (wide selection of Irish and international beers, and regular live music sessions)
http://homepage.eircom.net/~thebargeinn/Messrs-website/homepage.html (nearby with excellent beer)
http://www.winefoodbeer.com/against-the-grain/ (good beer selection, also serves food)
http://www.oneillsbar.com/ (carvery pub grub)
http://bull-and-castle.fxbuckley.ie/bull-and-castle-contact-us (steakhouse downstairs, beer hall upstairs, World and Irish beers)

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