Coming to AC for the 1st time this Feb. I will arrive in Belize City around 3pm. How long does water taxi take to get to AC? How much is a flight over there from Belize city?

Don't bother with the water taxi. Just take the puddle jumper direct from the airport.

I believe the last water taxi that goes all the way to San Pedro from the marine terminal in Belize, leaves at 4:30 p.m.
It is possible to make it to the boat, and I have many times-coming in on those afternoon flights, but if there are any delays, you will be stuck in Belize City overnight.
--Lee
www.caribbean-colors.com
www.cybercayecaulker.com

Yes, arriving at 3Pm may be pushing it. Taxi to the marine terminal is about 20 minutes (and about $20) so if you get delayed or customs takes long, don't chance it. Water taxi is 1 1/2 hrs and costs about $15 pp one way.