I took a 'little trip' in the spring of 2012 to see the Spring Classics (there is a thread somewhere that I wrote) and over the course of a month, went and saw RVV, P-R, Amstel, Fleche-Wallone, LBL, and a couple of stages of the Tour de Romandie.
RVV and P-R were done with a company who organise day tours, it cost money sure, but we saw the start of RVV, including access to the Team areas beforehand, then we travelled over to the Oude Kwaremount. For P-R we travelled down to the Arenburg Forest, then back to the Velodrome in Roubaix. The rest were done on my own, a position at the foot of the Cauberg for Amstel, visited Charleroi for the start of F-W, and then 150m before the top of the Mur, LBL at the Mery pub, and the Lausanne ITT and one of the road stages for TdR.
To me RVV was probably the best experience, huge crowds and good weather, and you could go and watch the big Screens, have a drink and some food between passes. The Mery pub was a good place to spend a Sunday afternoon too - A few TV's, plenty of food and drink and a train station across the road for access to and from..
If you just want to watch the race, stay at home and watch it on TV or a Live Stream, as you will see more, but experiencing some things 'in the flesh' just once is an experience you should try.