The outputs of the template are the instance IDs, so we can find it easily in the EC2 management console and the Public IP address. This means that we can get the IP to connect to the instance straight out of CloudFormation's output:

"Outputs" : {
  "InstanceId" : {
    "Description" : "InstanceId of the newly created EC2 instance",
    "Value" : { "Ref" : "EC2Instance" }
 },
 "PublicIP" : {
   "Description" : "Public IP address of the newly created EC2   instance",
 "Value" : { "Fn::GetAtt" : [ "EC2Instance", "PublicIp" ] }
 }
 }
 }