Australian in Seattle March/April

Hi all, I'm looking for recommendations for activities in nature in the very late/early days of March/April respectively. I was considering getting a van and staying in campsites, but I'm struggling to do my research. As someone who has hardly experienced snow at all the thought of driving on the wrong side, in a campervan, in icy conditions, is becoming unnerving. I'm not an avid hiker but am keen to try entry-level hikes. Some of the coastal parts don't intrigue me as much as the mountains.

I greatly appreciate any help and am sorry if this is a post you get a lot of!