The Sea Lion Caves scared me off at first as being too tourist-y and not worth the stop, however we couldn't resist when driving past it. It was pretty crowded, and as soon as we got into the gift shop we could see the webcam, which showed many Sea Lions on the rocks, despite some people saying that this wasn't the right time of year to view them.
We purchased our tickets, and the woman warned us that there was a bit of a walk and some steps - which was fine. There were wonderful views of the water and Heceta Head Lighthouse in the distance. We went down to the caves via elevator. Anyone who said they couldn't stand the smell has not spent much time on the coast! We didn't find it that bad, but maybe it was just our luck. The caves are dark, a 6 minute video plays on loop in a corner, the viewing area is a large window where you can see the sea lions on the rock. There are also more steps you can take to see the lighthouse if you'd wish.
Overall we were only there for 20-30 minutes, it was a nice stop and well worth it. I would just double check to make sure there ARE sea lions there before you pay!