Miami Flights

If you're travelling from somewhere within a few hours' flight, and at the last minute, DEFINITELY opt for flying to Fort Lauderdale instead of Miami International Airport. I couldn't get a flight to MIA anywhere near my departure date or price range, but through Fort Lauderdale, it was easier & cheaper.
F.L. is north of Miami, by about a half-hour drive, so to big-city dwellers, it's just like travelling across town... there ARE good shuttle-taxis available, where a group of up to about 6 people can share a cab (usually a van) - it cost me only $15, instead of a likely $50 taxi ride direct. Of course, the driver got himself lost (not just once, but 4 times! Thankfully, a couple of the passengers were native Miamians and directed him street-by-street - but I'm sure this was an isolated incident).
If you arrive during the day, it's not a big deal to get a local train down to the Miami MetroRail (the city's above-ground subway-type transit system - since the land is quite flat & swampy, there's no way to build an underground system), and then take it into the city, then transferring to whatever bus you need. If you have a little patience, it's a much better deal at @$5-10, but not if you're dragging a months' worth of suitcases with you.
The bus & MetroRail system is quite efficient, there are adequate maps & information around, and (since Sept. 11), enough security to ask for directions.

In Miami Beach, there's also The Wave, a small shuttle bus which costs 25 cents, & drives in circles around the main area of Miami Beach - if you're going within its limits, it's a steal of a deal!

Walking is good - there's usually something to see on the way to wherever you're going - and because Miami is 'flat-as-a-pancake', geographically, it's easy on the legs. The only ups-&-downs are when crossing bridges over the Miami river inlet.

Rollerblading - I took my own, since I'd used them only about 2 hours over 5 years... and spent a whole day on them, easily... again, flat land (& usually good pavement) makes a good exercise.

Bicycling - same as above - easy on the legs, & presumably plenty of rental places.

Cruise ship - the Miami Port is one of the busiest around, and is entirely on a separate island from the mainland. A huge bridge (a 'short' 15-minute walk across!) is the only link, but there's lots of traffic & few pedestrians.

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