Don't stop at every rest stop for 10-15 min a pop. Your legs will feel like concrete every time you get back on the bike.
I aim to stop every 30+/- miles, refuel, hit the mens room and go. And by refueling, I mean filling up the water bottles and my jersey pockets with stuff. Get in and get out.
Read number 4 above again, then read it again. Start easy, keep your pace at a conversation level, do not go into the red zone on climbs or during headwinds.