Forget sunblock, I say the best way to avoid sunburn is to stay indoors and avoid the sun altogether! There are plenty of ways to beat the heat during the summer that won't burn through your budget. For example, museums sometimes offer free admission. To shop indoors, stroll through local enclosed shopping malls, antique malls, and enjoy shopping events, like women's expos, at local convention centers.
Enjoying that epic flick on the big screen is cheaper if you take in a matinee and skip the snack bar. Check out the web sites of local movie theaters for any discounts and deals they are running. A cheap alternative to going out for a movie is enjoying a movie at home. Check out the movies at your local library. If you don't find your favorite flick at your library you can ask the librarian to order it for you or buy it cheap online. If a movie DVD, like The Devil Wears Prada, is more that a few years old you can often find it super cheap on amazon.com or ebay.com. I recently purchased a blockbuster movie DVD for under $5.00 online!
The easiest way to stay active while staying indoors is taking advantage of your local community centers. Many community centers offer exercise classes, exercise equipment and some community centers even have indoor pools! If sweating in public isn't your idea of a good time, check out the variety of fun classes offered by local community centers and community colleges.