The way I celebrate it is probably rooted in the way we used to in my Catholic school, as a reaction to the stuffy awed singing and processing to church. Then, it was about virginity and purity.
Of course, it's anything but.

Though some elements remain of course - anyone else remember having to hold those posies contained with doilies on the back with sweaty hands, whilst having to not trip over their white dress?
It's more - well, chaotic, and wild, and free than that. Exuberance - everything springing into heady life at last, with those giddy perfumes from the flowers, lambs ganging up in the fields and racing about, bats catching midges in the evening air. The variety and giddiness, and fertility of life. It's a time to take in rich deep sniffs of the warm earth and feel exhilarated by it.
It's a counterpoint to Samhain - instead of reflecting, considering, and honouring those gone, it's a time for getting out there and living. Though by doing this we are honouring those gone really, just in a different way!
That sums it up for me, I think.
The only thing that's changed really is that I'm thinking, considering and trying to distill my thoughts a little more. Specific to Beltaine, I suppose that means a little more poignancy - heh, I passed a group of teenagers on the way back from the woods and they were giggling like anything. I'm only ten or so years older than them but it's good to look at it from the other side of things and see others oblivious to the thinking behind it and just enjoying the moment, which is after all the point behind it for me really!
I hope that made some sense.