Why this plan is ordered by the tide, not the clock
Two reasons, and the second is the honest one.
The tide genuinely dictates the order here. The range on Amelia Island is 6 to 7.4 ft — large for Florida — and on a beach this flat that moves the waterline hundreds of yards. At low water you get a wide expanse of hard sand and the wadeable sandbars; at high water on a narrow access there is very little beach. Tides run about 50 minutes later each day, so "the morning" means nothing — the low tide does.
And we hold no confirmed opening hours. Not for a single business, museum or park on this island. So an hour-by-hour plan from us would be invented, and inventing a schedule is how people arrive at a locked door. Check today's tides, then ring anywhere you intend to eat.
Decide one thing first: when is low tide?
Low tide in the morning → beach first, town in the afternoon.
Low tide in the afternoon → town first, beach later.
That is the whole planning decision. Everything below fits either way.
The town half
Start at the Amelia Island Museum of History. An hour here makes everything afterwards read differently — this is the Isle of Eight Flags, named for a British princess while its city is named for a Spanish king, and the storefronts stop being pretty and start being legible.
Then walk Centre Street. The historic district is a 50-block grid and the useful part is about eight blocks across — Victorian storefronts, independent shops, and the harbour marina at the western end. The Palace Saloon is on the way.
Eat downtown. This is where the density is: twenty-plus kitchens inside a few walkable blocks. We list them with confirmed addresses and phone numbers and no hours, so call.
The beach and fort half
Fort Clinch State Park at the island's northern tip: a brick fort with ramparts and tunnels you walk into rather than look at, a long avenue of live oaks on the way in, its own beach and a fishing pier. Go early in summer — the brick is unshaded and July averages 90.7°F.
Then the beach at low water. Main Beach Park has a free lot, restrooms and the island's only confirmed seasonal lifeguard; North Beach is street parking and far quieter. At low tide either gives you hundreds of yards of hard, walkable sand and the exposed sandbars.
Finish on the west side
The island faces east, so the sunset is not a beach event — it happens over the Amelia River and the marsh on the other side. Downtown, the marina, or a marsh overlook. Getting this backwards costs people an evening; see sunrise and sunset.
What to leave out of one day
The marsh. A kayak trip into the creeks is the best thing on this island and it needs half a day and a booking — it belongs in a two-day plan. Same for Cumberland Island, which is a full day in itself.
If you only want the list rather than the plan, things to do in one day is the ranked version.