Acadia National Park in Maine. The park has 40 or so miles of carriage roads that are fun to ride. Plus, the area offers kayaking and hiking. Just be forewarned that it will be crowded.
I've been to Moab in April during a warm spell (low 90s). Low humidity only gets you so far when the temps are that high.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher