With 30 amp you will be limited as to how many high amp appliances you can run at ONE time.
Typically, with the A/C on you will not be able to use your microwave-well you can for about 3 seconds.
If you have dual A/C, you can run one at a time. TV, dvd player, water heater on electric with the A/C is ok. You may consider adding up the amperage draw of the items you want to run.
Remember startup up the compressor for the A/C will always take more amps than running amps-it is a good idea to start it first.
Your limiting factor here is not the adapter you mentioned in the thread title, but the 30 amp power being supplied at the pedestal.