lenlu- I definitely like your suggestion.
We plan to leave on day 3 for Crater lake and staying in the park overnight.
Day 4 - we plan to hike and do the standard boat tour (the first one)
Then head to rainer maybe this is where we are not sure.
If we have enough time to do rainer and helens or should we just do one

Whatever you decide it'll be a good, fast trip. These guys remark about the portion on Crater Lake taking you till the early afternoon and I didn't realize that. So, it's definitely something you'd need to tweak. Have fun!