Have dl-ed Summerset Isle. Had Googled, searched but cannot fine a list of quests for this Mod.

Would like to know before I start, so I don't miss something. Any help appreciated.

? Where did you download it? The don't describe the content out there?

Read the description. And with the download comes a Quest Guide.doc that should get you started. Not not all quests that are available are listed there, you will come across them when you explore the location. The author says: "This mod does not hold your hand."