I'm homeschooling my oldest in first grade, but her younger brother is 5 entering K (home) and he's SOOOO FAR AHEAD from being around for all her lessons. If I went to put him in kindergarten next year he'd practically be ready for first grade. Anyway. Kindergarten is great because it's really loose. Plenty of homeschool activities, travel, hands on stuff. My son has absorbed lots of ancient history through all the reading I did with his sister during the year and all the library books...I follow The Well Trained Mind style.
BIG TIP: Get lots of library books from all educational sections each trip as well as fun reading. One or two on space, plants, biographies, animals, dinosaurs, fun books, etc. the book "What Your Kindergartner Should now is a another good guide.
My favorite actual curricula for kindergarten are: Math: Math-U-See, Primer level. My daughter has been so ahead for first grade having had this math foundation in kindergarten.
Favorite reading resource: "The Ordinary Parent's Guide to Teaching Reading" Wise and Buffington. We use a chalkboard for daily lessons and his reading is excellent.
Flexibility to travel at this age and experience things in the real world is so awesome. One major advantage to homeschooling is the ability to get lots of material into little hours so there is much more time for extra activities: music lessons, sports, play time, whatever. My daughter has advanced subjects every day and STILL has all afternoon to practice piano, violin and attend Tae Kwon Do AND play with friends and rest. She's already into her second grade work and it's not even summer. Tomorrow we're going to a homeschool event at our local National Park. Do it if you can!
Also, I keep track of what my daughter's friends are doing in school. We're in a bad district. My daughter is writing in cursive and manuscript neatly, has learned nouns, verbs, pronouns, she reads like crazy from advanced chapter books, memorizes poems, reads classic literature for grammar and dictation and writing lessons...does lots of history related crafts, has built a timeline of the era we're working through, science experiments etc...her friends in our local first grade haven't done any of those things yet. And we've also taken a million little trips to do things on school days.
****Here in PA I know lots of people who have had their kids in and out of schools with no problems transferring. One friend homeschooled several years and lived in France for several years with kids in school there. They now attend high school here and love it and had no problems adjusting. One just got accepted to the college she wanted.
***Here in PA you register with state by age 8 so I haven'thad to do that yet, but I have been building portfolios and reading lists since mid-kindergarten for my 7 year old. She will take the first standardized test in third grade at the school with other students.