Take care of the group. The people that you tour with affect your whole day. For example, touring with young children should include an afternoon nap, as Epcot is a stimulating environment, and is generally open late. Touring with older adults may require a long, relaxing mid-day meal or trip to the hotel pool. However, 2 healthy, young, energetic adults can enjoy a day at Epcot with few adjustments or problems.
Be careful of the weather. Summers are hot in Florida, so bring appropriate amounts of water and portable necklace fans. Furnish young children's strollers with a visor. Rain is always a factor in Florida, so plan for it and avoid surprises. Florida is temperate in other months, and enjoying your day may require less weather-related planning in the winter, so consider the season when you plan your vacation.
Plan your tour carefully. Many new tourists or self-pronounced free spirits eschew this advice, but to get the most from your expensive vacation, plan well. Many Internet sites list the best days/times of the year to avoid crowds at Epcot. In addition, a listing of attraction descriptions and appropriate age levels is available at Disney's own website--use it to narrow down your list of "must sees."
Avoid lines and crowds by using a paid touring service. Some websites and services offer research on theme parks that may cut down your ride waiting time by applying crowd pattern observations and similar devices. Look into these services if you want to avoid lines and crowds.