Obama Hits the Links Ahead of Birthday Bash on Martha's Vineyard

Barack Obama's attitude toward his mega birthday bash -- which still looks pretty mega at this point -- seems to pretty much be ... forrrrrreeeeeget about it.

The ex-Prez was seen playing a round of golf Saturday on Martha's Vineyard with pals, not too far from where he'll be holding his big shindig later tonight -- which is still expected to host scores of people ... this in spite of him claiming to have scaled it back.

The apparent contradiction to his announced plans doesn't seem to be bothering BO one bit, though -- 'cause the dude was all smiles on the links.

Check out these pics of 44 fore-ing it up in grey, and taking some big swings on the fairway -- he looks about as polished as ever ... even when he shanks one, which he didn't appear to do a whole lot of here. Looks like he was mindful of blisters, too ... wearing bandages on his gloveless hand.

These are the same good-time vibes we saw at last night's leadup to the party -- where a crap ton of people (upwards of 300, we're told) came out for a pre-game of sorts ... laughing it up at a house Barry seems to have rented for the festivities. This, in addition to the giant tent he has on standby for the night of, we might add.

After a raucous night of fun, it would seem Barack had energy and then some for a game.

As we've reported ... people on the island are pissed over the multi-night gatherings for a number of reasons -- not the least of which include roads being blocked off for locals.