Recently, My kids and I (boy, 14 and girl,
took a break and did a mini research/study of Japan. We did this after reading a book by Allen Say called "Grandfather's Journey." We put our regular book work aside during this and spend a few weeks on this "unit study." After this they were ready to get back to their regular subjects.
We find that spreading out our year to do some in the summer months beats the summer boredoms. We do a year round schedule, with breaks every few weeks, our time off is usually only 2 or 3 days at a time. We do a week off for vacations, but even we find things to do and learning opportunities going places. We are never without a good book to read while traveling in the car. They like books on tape too while we travel.
We put their research and work in a book form. My dd found pictures of things she read about, such their culture, foods, land, animals, customs, clothing, and houses.
My ds wrote a short essay, and included pictures of war planes, War World II and about the A bombs that were dropped on Japan. He found some interesting information reading and researching in books from the library and on the computers.
We usually go to the library once a week or at the most 3 times a month,
Science can be done outside. Study animals in your area. Do a bird study, study about squirrels, find books at the library about their habitats, food, other facts, study their body parts, bones, and etc.
I also recommend a website that I use for worksheets for science, history and etc. it is enchanted learning http://www.enchantedlearning.com
If you don't have a computer at home, use the library's computers. Our library has computers for children in the children's area for their use, during the school day, they have them to their selves, and it is quiet with only a few preschoolers or other homeschoolers around.
I also suggest finding a homeschool support group in your area for field trips, play-dates, socialization with other kids and parents, and co-op lessons to enhance what your child is learning.