Get a spray that contains permethrin and use it to treat your clothes. It must only be applied to clothing and not to your skin. You need to do this in advance so it will dry - read and follow the directions exactly. The stuff I've used recently came from Dick's Sporting Goods and is called "Permethrin Clothing and Gear Premium Insect Repellent" -
http://www.sawyer.com/bugs.html
You will need to go to a sporting goods store to find this stuff, none of the grocery stores, drug stores or department stores seem to carry it. For awhile WalMart sold a brand called "Permanone" that was great, but I don't think they carry it anymore. Some people feel this is actually a conspiracy on the part of the big companies who make DEET based products like "Off".
If you use this stuff properly and take other sensible precautions - wear a hat and long pants tucked into your socks, you can basically forget about the ticks. I live out in the woods and am outside everyday.
I rotate between a couple separate sets of "outdoor clothes" and treat - pants, shirt, socks and shoes. It is effective for a couple weeks and can even survive a washing or two - you will need to experiment some on your own to determine how often to treat.
Do a search on this site for "permethrin" and you will find a lot of discussion.