This area is beautiful. You can walk along the River and eat by the water at several really excellent restaurants. I grew up in Fort Lauderdale and this area has really blossomed over the years. You can make an afternoon of visiting the Museum - eating by the water and there are also several nice boat tours that you can...
So many nice water views right in the heart of the city. It's a nice river, it's fairly clean and there are so many boats and nice tours on it too. But you can still just enjoy it's beauty from the riverbank.
Spend a day going up and down the river if you have a boat. If not you can rent one at several places or take a tour or water taxi. Watch for manatees and check out all the beautiful million dollar homes. You can even go past but not close to the big cruise ships.
You will love the historic hotels, the lovely riverside, the boats, the opera house and the museums. You can take a free water taxi or wander until you find a nice place to eat or have a drink. The first Sunday of the month there is a free jazz brunch.