What are your ports and budget??? Unfortunately, I don't recommend many tours for very young children- they are costly and involved, flights are my top recommendation but again usually not appropriate for very young children. A lot of tours don't have "down time" or the ability to "get away" and having a restless or uninterested child can make for unhappy travelers. You may want to consider looking at shorter bus tours in port, consider walking tours, etc. The raft tour in Haines is usually 4 hours, usually too long for a 3 year old with the added ferry time if you are not porting in Haines. Wildlife is brief and distant.