i have been to little sahara twice. i havent been to silver lakes but we planned a trip there once because its MUCH closer to PA. we didn't go because of the crappy weather. Also, they have this 'voucher system' where you have certian times allowed on the dunes. (check out the link below, i just skimmed through). the website should tell you what you need to know.
http://www.silverlakesanddunes.com/
i would recommend little saraha. but that depends on where you live because there like 1000 miles apart. at little sahara you can ride all day and all night for 7$.
though it would be pretty cool to have a lake to mess around in too. at little sahara there is always these huge ponds behind some dunes that could make up for the lack of a lake :wink:
i heard that you need a spark arrestor and your quad has to have a sound decimal test. i could be wrong