This series will be a good place to start to find several cache types in one day (hence, the title, which is also a great DMB song). It won't be a super impressive busy day, as far as busy day challenges go, but it will get you started anyhow. Just for fun, I'll be putting out all sizes of containers, as well.
I haven't walked this trail during the summer, so I can't vouch for the PI situation. However, based on the signs I've seen during the winter, there likely will be PI.