Avoid pools at all costs over the summer. As noted by Dave they will sterilise your manhood and cause you to forget how to kayak.
Canals and Rivers arn't that cold over summer. Go play Polo, Marathon, Sprint, Slalom, whatever at Wildwater Kayak Club, Kilcock Canoe Polo Club or Salmon Leap Canoe Club (or whatever club is closest to you).
Wildwater Kayak Club do a student membership of €50. You can buy it or not, they don't care that much. I'm planning on buying it this summer
. You can do pretty much anything there (Marathon, WWR, Slalom, Sprint, Polo, the works). I paddled there all last summer, it's great craic.
Kilcock Canoe Polo Club only have the adult membership rate (€100 I think it was). If you paddle with them more than once, you have to pay it, no messing. Probably the best spot to go to to learn Canoe Polo, they're ridiculously good. I paddled there for the whole summer at the end of first year.
Salmon Leap Canoe Club I don't know that much about. They appear to have marathon races every Wednesday and I assume they do training too.
If possible over the summer you should try get to as many of the polo competitions as possible, they'll have you away for every second or third weekend camping somewhere down the country. It's ridiculously good fun.
I'm also planning on getting going to Clifden to do some freestyle, it's an amazing feature in Galway that's perfectly predictable, go there if at all possible.
Lastly, if you want to do something, just ask the committee for gear / borrow it off another club / national committee if UCDCC don't have it. People are generally pretty sound about lending gear. Get out there, do your thing,
make your paddling happen yourself, no-one is going to make it happen for you over the summer but try stay outdoors, it's worth it.