The aptly named Loews Miami Beach Hotel is probably perfect for your needs. It's very popular, and few have had anything negative to say about it. If that's outside of your price range, though, there's always the Sense South Beach Hotel. It's hard to get much closer to the water than that!
Flamingo Park is praised as both a lovely place to visit and a pet-friendly playground perfect for the whole family, including the four-legged variety. You'll find it on 11th street, but in case it's not the perfect place for you, keep South Pointe park in mind as a suitable alternative.
I went on a Bachelorrette trip there too, although i didnt have to plan it! We stayed at the MGM Skylofts which I thought were really really nice. Dinner was over at Nobu in the Hard Rock, which was fun, but honestly overrated, especially having to get off the strip, but we were going to the club inside of the hotel so it was fine.... wouldn't trek all the way over there just for dinner. Especially when I later saw all of the cool places that were right inside MGM! If you are going when it is warm DEFINITLEY get a cabana poolside... so happy for the shade and comfort!
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