T.F.
I first have to say that Dawn B. is wrong! He is not too young to go camping. My son has been camping since he was 4 months old. He is 3 1/2 now and loves camping. He packs his own backpack and gets his toys ready. Of course I have to make sure he remembers his cloths but he packs his sleeping bag, flashlight and beanie and then there is always random things that he stuffs in there.
If you are planning on fishing I would get a backpack carrier for him. If you don't have one I would first try Craigslist but for a new one I would go to REI. You could give him a little pole with no line on it just for him to play with.
I have never had any problems with getting my son to sleep. He has always been so tired by the end of the day that he is out like a light. When he was really little he would share my sleeping bag. By the time he was your childs age we got him is own sleeping bag. Depending were we are camping I usually take his Thomas the Train fold out couch for him to sleep on between my husband and I in the tent. I put the bottom half under his couch then zip the top part over him and the couch. If its cold I will stick another blanket inside the sleeping bag. I also do layers on him for bed. Usually long underwear and fleece footie pjs. My son actually asks me if he can go to bed now when we are camping.
As far as food goes I just take what he would eat at home with us camping.
Bring lots of change of clothes and let him crawl around and explorer. Just remember he is going to get dirty and he will probably eat dirt too. I have had to give my son two baths after some camping trips. LOL!
You could always have a camp out in your back yard just to see how it goes. My husband and son have slept in the back yard a few times. They have a great time.
Hope you have a great time.
Tina
Forgot to add that once he is walking glow sticks for the night time are great. I tie a glow stick to the back of his pants and he has a headlight flash light so he can see and play at the same time. I also tie a glow stick to the dogs collar.