I've also seen quite a few warblers in the trees along the river during my runs either in the morning or after work. I've read that the best time for birding is either early morning or dusk and it's been true according to my experiences.
The two warblers I've been able to remember and identify are:
Black and White Warbler:
Courtesy of www.jeffraflik.com
Courtesy of www.jnweb.com/british-columbia/
I'll pick up with my Hawaii posts soon enough. I still have my Kauai pictures to post so there should be at least one or two more posts from Hawaii.
I really want to get in some more birdwatching locally now that the weather's nice. I'm going to North Truro on Cape Cod for Memorial Day weekend and I'm looking forward to stopping by the Wellfleet Sanctuary. It's over 1,000 acres of wetlands, beach and pine woods. I know it's an amazing spot for birdwatching and I really want to check it out.