DH and I went to Alaska about 6 years ago for a friends wedding. We spent two weeks there. Seward was a nice town and we went kayaking. It was cool because they took us out about 5miles and dropped us off with the kayaks on a little island and we paddled back along the coast line. It was nice because it was just DH and I....so we had the water prett much to ourselves. I would not do it without a guide if you have never kayaked much or are not used to open choppy water. We saw all sorts of marine life.
As for the town from what I can remember was nice. Homer is more touristy. There was a nice restaurant in Seward near the glacier..I think it was north of the town. We spent 1 week in this area then head for Denali NP
and spent 1 week there. We lucked out at we could see the mtn the whole time. We took the bus into the park as far as it can go. We saw lots of grizzly bears, wolves, etc. I am not typically one for group things but this was worth it. I think if memory serves me right we were not allowed to drive into the park with our car.
Hope this helps.