Are you likely to be able to see sea lions in the cave the 1st week of April?
The probability of finding sea lions goes down with the advance of Spring. There may be stragglers in May but if they are gone the nice folks at SLC will give you a pass to come back within one year and see them for free. Regardless of whether or not the lions are there it is a nice family experience.
Winter is best. Spring is breeding season so the sea lions are more apt to be out on the rocks. There is also a viewing area there.
Get quick answers from Sea Lion Caves staff and past visitors.