well, some easy stuff: put on some bar ends (gives you another hand position), rack, rear basket and fenders. oh and a handlebar bag (you can get one cheap at walmart that has a nice capacity). I use the handlebar bag to hold tubes, multi-tool, tire levers. If you ride at night a light (cree 1200 lumen light on amazon for something like $20)... I also put on thinner tires in order to make the bike more spritely...