I take it you mean the harbour area?
If so you can try:
Bella Vista Hotel: 021 4812450 - Self drive boats - can provide a guide
Richie Ryan: 086-1940744
http://www.corkbass.com Not sure of James McSweeney's online status but his number is 087 6019218
You also have Mark Houlihan 085-7794377 - Again I am not sure of his current status. I think Mark tows to various locations
There may be others, especially around Kinsale & Courtmacsherry area.