Hi Monja,
So excited for your upcoming trip! That week will be super busy so just be prepared for that before you go. I checked the calendars for Wishes at MK; Illuminations at Epcot & Fantasmic! at DHS for April 5th - 9th. During those dates, Wishes is scheduled for 10:00 p.m. every night; Illuminations at 9:00 p.m. every night and Fantasmic! is scheduled for 8:30 p.m. every night. Please keep in mind that the schedules are subject to change so I'd recommend checking the on-line calendar closer to your visit.
To check the online calendar for April for DHS click
here; for MK click
here & for Epcot click
here. From there click on a specific day for a schedule of parades & nighttime entertainment.
You can view Wishes from many locations throughout the park. My favorite is in the Rose Garden because Tinker Bell flies right over your head from Cinderella Castle to Tomorrowland.
Illuminations can be viewed anywhere in the World Showcase that offers a clear view of the lagoon. Check for the direction the wind is blowing & sit opposite of it so that the smoke from the fireworks doesn't head towards you. I really like sitting outdoors at the Rose & Crown Pub in the United Kingdom Pavilion.
For Fantasmic!, any seat in the theater is good - just avoid sitting behind the big poles that can obstruct your view for some portions of the performance.
Wherever you decide to sit for any of the night time entertainment, make sure you arrive way early & plan to stick it out. Relax & enjoy! Wishing you magical memories!