Hello S. D.!
My name is C. and I live in California. I was very excited to reply to your questions because my family and I just returned from our third trip to Disneylad back in January of this year. I have to say that this most recent trip was our best one yet!
About the hotel, we have never particularly stayed at the Disneyland Hotel, but have had a friend stay there with her family. She loved it because it was walking distance to the entrance of the park. So they would go back to the hotel to take naps, in the middle of the day, and of the sort and then head back to the park for some more fun. But there are other hotels that aren't on the park property, but within walking distance to the entrances. It might be worth to check those out, per prices and whatnot.
But a tip about the Disneyland Hotel, you have to go to Goofy's Kitchen!! It's a breakfast buffett that features Goofy and some other characters, like Chip and Dale, Princess Jasmine, Belle, and Pluto. The buffett is amazing and totally worth the higher price tag. I think you have to call a month in advance and try to get an earlier reservation time.
About the rides, yes 2 yr olds can ride many rides. We planned to hit most of these rides early in the morning which mean smaller lines. When you enter the park you will walk down Main Street and right into the castle, walk though the castle and there are a bunch of rides for the young ones and they also should be fun for your 5 yr. old. Like the merry-go-round, Teacups, Dumbo, It's a Small World, and then head over to Toon Town. Toon Town is located past It's a Small World and is geared specifically to younger kids. Also, Micky and Minnie's house is located in Toon Town to get pictures with them. You might also find them just walking around in there.
The girls might love the Princess Pavilion(not sure if that is it's specific name), but it is next to the Small World ride and has princess shows. I have two boys so we have never been too it, but it always seems packed when we walk by.
Your boy would definetly love going into Tomorrow Land! They have a Buzz Lightyear ride that is so much fun, even for everyone! The new Nemo submarine ride is now open as well. We went on that and my one year loved it!!
One tip I tell all my friends when they go for their first time, go to the Mad Hatters shop located right as you walk into the park. You get your Mickey Ears and you can get it personalized for FREE! But go early cause these shops get crazy through out the day. It's the shop we hit first to get the boys their ears and it's also a great gift.
I would recommend renting their strollers. They are very comfortable and have a little basket underneath to put stuff in. They slip a piece of paper on it so you know when one is yours when you park your stroller when you ride rides. They don't have doubles and I don't know if your five year old rides in a stroller. I have a three yr old and a 15 mo. old.
I'm not sure how long you are staying at Disneyland, but they might have these tickets called two-fer tickets. You pay for the admission to one park and then you can get into the park as well. We used the ticket where you can go to both parks in one day.
Now I will have to tell you, California Adventure Land, is like a boardwalk. It is geared to an older visitor. They do have some kiddie rides but it's not as "Disney-like". I have heard they have another Buzz ride in California that is pretty fun and there is a It's A Bug's Life ride that my boys went on and enjoyed it. Oh, they do have a Disney Playhouse Live Show in there as well that is fun for the kids.
In the way of food for kids, I am very happy to see more healthy like options. They also do have these fruit carts as I like to call them. They have great snack food, like grapes, bananas, apples. They also have juices and water. So you don't necessarly have to bring snack food in with you.
If you kids are still in diapers (like my youngest) there is a very clean breastfeeding/diaper changing station located at the end of Main Street. We used that multiple times, but all the bathrooms are very clean and both the male/female bathrooms have changing stations.
Oh a tid bit about the parade which I so recommend to watch. But you need to stake out a place about thirty minutes before the parade starts. Spaces on the curb fill up quickly. We have always gotten a spot along Main Street.
I hope this helps in some way! In April you should have nice weather, one of the times we went we went in March and it was a little warm standing in line. If you have any questions please feel free to contact me! Hope you and your family have a wonderful time!
C. C.