Fun on the Platte, Denver's largest free swimming spot (Confluence Park)
Loveland Pass Marsh Marigold in early bud, sometimes called Elk's Lip (Psychrophila leptosepala)
Loveland Pass Sky Pilot (Polomonium viscosum), also known as skunkweed. One of my favorite of the alpines - blooms early, and please don't put it to your nose to smell; pollinated by flies - need I say more?!?!?!