Key's RV trip
Everyones info is great. Camping and kids stuff in the upper keys: You have John Pennakamp state park on the ocean side, the prices are reasonable and lots of stuff for the kids. They have boat rentals, glass bottom boat, beach thats great for swimming, eco trips kayaks and canoe's, dive and snorkel trips, a small aquairium, and nature trails. stop and the sites at holiday Isle. Must see the tarpon at Robbies Marina.
futher south on us 1 is The KOA at Fiesta Key just south of the channel 5 bridge. Not much in Marathon for tourist just the seven mile bridge and visitor center on the old bridge.
long key state park is on the north side of marathon with camping south of the koa so you have options their.
Bahia honda state park is the nicest beach in the keys. Big pine key has some camping also.
key west: You have fort Zachary Taylor in key west not sure about camping but a good time for the family with beaches and walking trails with great views of the harbor and all the boat traffic.
you also have the key west aquairium and several pirate and sunken treasure museums on the island.
Fishing from land or the bridges all depends on the tide and most folks due it at night. when the sun is not so strong.
As far as food goes I have eaten at or had drinks at alot of the places from key largo to key west and you cant go wrong at any of them.
If you have any questions I should be able to answer them. I lived in key largo for 5 years and worked at the coast guard station in islamorada. I have lived in key west for the last 2 years and work at the key west coast guard small boat station. Hope you have a great time in paradise.