I seem to get myself in interesting situations when it is my last hand before I leave the table. The table has been very passive and I have been stealing pots with agression for the last hour.

UTG+1 is a fairly standard player at 23/15/1.43 at about 200+ hands and
MP1 is at 22/2/27 after about 30 hands.

Party Poker 0.50/1 Hold'em (7 handed) FTR converter on zerodivide.cx

Preflop: Hero is UTG with 7c, Ah.
Hero calls, MP1 raises, 1 fold, CO calls, 1 fold, SB calls, 1 fold, Hero calls.

Flop: (9 SB) 7s, 8s, 7h (4 players)
SB bets, Hero raises, MP1 calls, CO folds, SB calls.

Turn: (7.50 BB) 8h (3 players)
SB checks, Hero bets, MP1 calls, SB calls.

River: (10.50 BB) Ks (3 players)
SB checks, Hero bets, MP1 raises, SB calls, Hero ............................

!!!
Fold preflop
Then fold again PF when MP1 raises.
Flop good
Turn standard
River is a really, really, really easy call.
No offense or anything, but you really need to learn the basics of hold 'em. Read Small Stakes Hold 'em.

There's no chance you fold there. You're probably at best chopping, but the put is huge by that point.

A/7s isn't a fold preflop in loose-ish games.

Do you normal call or 3-bet this river?

Hero has A7 o. So yea its a fold preflop UTG even at a 7 handed game. River is def just call.