Transportation for a cruise from Miami

[Gzub1003]

I am looking at a cruise from Miami in September. There will be 7 of us 5 adults and 2 children (8 and 3). We will be flying out a day early and spending a night at a hotel in Miami. Looking for what other people have done as far as transportation from the airport to hotel and from hotel to cruise port? My concern with using Uber/Lyft is not having a seat for my younger child to sit in. And thought would be great. Thanks.