I travel all over the place. (I'm up to 4 continents now!) It was scary at first, and oddly enough, the first real vacation I went on was to San Diego, which I loved. Balboa park is da boss. Your original post sounded like you could use some generalized information Here's my tips:
Figure out your budget. Keep to it.
Buy a good travel guide. I like lonely planet and rough guides. Check the date on publishing and make sure it's as recent as possible. Read it, cover to cover. It is the best investment you can make if you're doing some real traveling as opposed to staying at a resort.
$300 RT for airfare across the country is good. $1000 is not. Get to the airport two hours early, and bring a book. Then you will not be stressed. Do not check your bags when going. Get up repeatedly on the plane and walk up and down the aisles and then go and do some stretches near the bathrooms. You will be highly disoriented when you get out of the plane so ask people what to do. There is always an information booth and people to point you where to go. Hotels can help you arrange your airport to hotel transfer, as can hostels and resorts.
If I have to rent a car, I usually figure $100 a day. However, I usually end up using public transport as it is CRAZY cheaper and then you get to see stuff you might not expect. And if that doesn't work, taxis are still often cheaper and then you can ask stuff from the driver.
Pack light. You can buy whatever it is you need and then you've got souvenir socks as opposed to souvenir knickknacks, and socks are better to have. Reduce your electronics. You can always do your laundry in the sink.
Hit a grocery store on your first day. You will have forgot something. And also then you can buy toiletries as opposed to bringing them, which is easier for going through airport security.
Choose somewhere with one thing you REALLY wanna do and invest some serious cash in that. I chose San Diego because I have a critter obsession, and the zoo is the greatest zoo in the world. So my main thing was to go to the Zoo, and then I added on a bunch of other interesting things. There are always other interesting things wherever you go, except for in Corbett, Oregon, which you really can miss. Yes, this is a joke.
Plan on some chill time. Otherwise, you will be like this-->
Something will go horribly wrong. Expect it and then when it's happened, you're home free!
Hostels can be found for $20 a night for a dorm bed, $40 a night for a private room. They're not as generic and nameless as hotels and often have group activities, like a movie night or group dinner. Some are skanky, some are fantastic. Look online and you'll get recommendations and can look at pictures.
Do not spend all your time photographing stuff unless you are a photographer.
I have never used a travel agent cuz I can always plan it better and cheaper myself. Ditto with the group tour. Never been on one where it wasn't mostly disappointing and shopping oriented. I wouldn't do a package tour, but the farm sounds like it could be cool. I've done a dino dig in Alberta too, which was great. I found a hadrosaur tooth!