We are planning to take our 1st trip to San Francisco over 4th of July weekend. We'll probably stay 4-6 days. I am so confused over what area to stay in? We are 4 adults in our late 20's to mid 30's. Looking to do some touristy stuff and avoid cab far as much as possible. Can someone suggest some nice hotels for someone on a budget ($100/nt or less) - is that even possible?