Staying at the Dolphin in July for a conference

So I have two questions for those familiar with the Dolphin. First, I have a resort view room with a balcony. Am I likely to see the fireworks from Hollywood Studios or Epcot? Second, I have swag that I’ll be giving away at the conference and I’m thinking about mailing it to the hotel, but I’m nervous. Has anyone mailed things successfully to the Dolphin or another WDW hotel? We’re staying at the AoA before I transfer to the Dolphin.