What a lovely area to visit, not to sure about in February though, as it may be cold, but looking forward to your trip report afterwards.
I stayed in the Maritime in Bantry last October and really liked it a lot - wrote a review, tripadvisor.com/ShowUserReviews-g211922-d651…
It has a beautiful leisure centres and the restaurant is good for both breakfast and evening meal. The bar wasn't great to be honest but I recommend the large bowl of mussels in the bar if you want something light to eat. Make sure you ask for a room on the top floor as the bedrooms face onto the main street and while it isn't particularly noisy, it's better to be safe than sorry.
Sadly, Batnry town itself was badly littered and could do with a little TLC. Just down the road (two mins walk) is a very good Centra mini market where you can buy any nibbles, newspapers or vino that you might like to take to your room.
Mary99 has given you good ideas up there. Also consider Bantry house which is only 'up the road' but alas the house is not open until March but you may be able to walk in the gardens which are very impressive www.bantryhouse.com
Beara Peninsula is beautiful and Mary99 has put a link there to that. There is so much to see on this pen that I wouldn't know where to start, but Castletownbere and Allihies are two villages of note to aim for if you have time.
Do not leave Bantry without driving on the Sheeps Head peninsula. It is gorgeous and not far from Bantry. It is a lot smaller than Beara Pen. The little village of Durrus has a very nice restaurant that you should try and get to for lunch or dinner (if it is open) www.thegoodthingscafe.com
You must drive your car to the tip of the peninsula, park at the little carpark near the end and walk out (weather permitting) to the very tip of the peninsula where the views are stunning. On the way back why not stop in Ahakista and look at the memorial garden and large sundial in memory of the Air India disaster of 1985. (Ahakista is also home to Graham Norton, so why not search him out and join him for pint !)
Mizen head is out at the end of the Mizen Peninsula and while it is probalby worth a visit if you have time you must pay for the privilege and personally I think the Sheeps head tip is much nicer, less touristy and free!
You mentioned walking and the whole area around Bantry is a walkers paradise.
Enjoy your trip and fingers crossed here for dry weather.
