Celebrating Life... but where?

I'm approaching a milestone birthday... and had decided long ago I wanted to do something special to celebrate. I have certain commitments that prevent me from taking that 7 day cruise thru Alaska...or even the all-inclusive stays in Mexico. I don't hike, fishing and golf are ok, I love looking at water, ocean would be best, but Lakes are good too... I'd love to get some sun but am not a 'beach sun-bather' (too boring), could do withought the mountains, so I'm searching the map of the US for places to go, things to do and sites to see... Any and all suggestions welcome... what would YOU want to do for a milestone birthday. My time is running out... where do I go?