1) It is rather easy to make your day more structured, without using a curriculum. Read books on the couch each day in the mid-morning, sit at the table together (writing, drawing, etc.) at the same time each day. Pick a different activity for each afternoon: painting, arts & crafts, playdoh/clay, science experiments (from a library book?), puzzles, board games/ card games, baking, etc. When the weather is warm, we have a different routine, we're out of the house more. Monday is beach day, Wednesday is park day, thursday is hiking day, Friday is library day. There are many, many activities you can schedule or add to your routine if you're simply looking for more structure.
2) All of that said, I can share my 1st grade curriculum thoughts. For my first grader this year, I am using SonLight (minus the religious books). SonLight is mostly a reading list. There are additional comprehension and discussion questions, but most of the questions are things I would ask my children without prompting. I've found that my DS has enjoyed approximately half of the read-aloud books this year, the other half he has merely tolerated. Although it is possible to purchase complete language arts and math curriculums from SL, I chose to do my own thing. My DS is using Explode the Code workbooks and reading easy-reader library books of his choice for phonics, and Miquon for math.
Next year, I am planning to use Winter Promise for all of my children (including the child who will be 1st grade age next year). Although it is a literature based curriculum (as is SonLight), Winter Promise has the reputation for being more hands-on than SL. It is a Christian curriculum, but we will leave the christian references out (I've heard this is VERY easy to do). In addition to using Winter Promise, I will add on the language arts and math programs that we are currently using.