just don't rush, take everything in! enjoy the people and your surroundings. try and get ur tickets before you get to the park, or then you have to wait in LONG lines!! try to get a hopper to help you see everything. try and see all the parades, shows and fireworks at the parks, there AMAZING!! ride all the rides and don't forget FASTPASS where it is available. Go into shops and look around, get what you want if you will only be in that park for one day, if you are coming back, wait till your last day so you get everything! and lastly, HAVE FUN!!! don't let anyone ruining your disney experience!!!
PS, don't forget about the food!! its the best stuff in the world!! and you must get a mickey ice cream bar---u'll never think of ice cream the same way again!!!