AK river decision in tough spots

hand 1: villian is unknown. Do we have to call his river bet after calling turn raise in a 3 bet pot? The board looks scary though. Any thoughts on shoving on the turn vs an unknown player?
No-Limit Hold'em, $1.00 BB (8 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

Hero (BB) ($100)
UTG ($133.10)
UTG+1 ($107.50)
MP1 ($118.60)
MP2 ($253.25)
CO ($100)
Button ($100)
SB ($103.15)

Preflop: Hero is BB with Ahttp://www.flopturnriver.com/phpBB2/...es/diamond.gif, Khttp://www.flopturnriver.com/phpBB2/...miles/club.gif
3 folds, MP2 bets $3, 3 folds, Hero raises $10, MP2 calls $8

Flop: ($22.50) 6http://www.flopturnriver.com/phpBB2/...iles/heart.gif, 4http://www.flopturnriver.com/phpBB2/...miles/club.gif, 8http://www.flopturnriver.com/phpBB2/...miles/club.gif (2 players)
Hero checks, MP2 checks

Turn: ($22.50) Ahttp://www.flopturnriver.com/phpBB2/...miles/club.gif (2 players)
Hero bets $12, MP2 raises $25, Hero calls $13

River: ($72.50) Qhttp://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
Hero checks, MP2 bets $35, [i]Hero ?

hand 2: villian is an uber nit running 11/7/2. His 3 bet% is only 2%. Fold to cbet% is 75%. I dB on this nice board and hit my nuts flush but he snapped shove. weak tight and fold? The thing is I cant really see this guy ever slow play sets except 99.
No-Limit Hold'em, $1.00 BB (9 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

MP2 ($137.55)
MP3 ($100)
CO ($100)
Button ($124.95)
SB ($175.20)
BB ($100)
Hero (UTG) ($100)
UTG+1 ($128.70)
MP1 ($113.65)

Preflop: Hero is UTG with Khttp://www.flopturnriver.com/phpBB2/...miles/club.gif, Ahttp://www.flopturnriver.com/phpBB2/...iles/spade.gif
Hero bets $4, 4 folds, CO calls $4, 3 folds

Flop: ($9.50) 3http://www.flopturnriver.com/phpBB2/...iles/spade.gif, 5http://www.flopturnriver.com/phpBB2/...iles/spade.gif, 2http://www.flopturnriver.com/phpBB2/...miles/club.gif (2 players)
Hero bets $6, CO calls $6

Turn: ($21.50) 9http://www.flopturnriver.com/phpBB2/...iles/spade.gif (2 players)
Hero bets $14, CO calls $14

River: ($49.50) 2http://www.flopturnriver.com/phpBB2/...iles/spade.gif (2 players)
Hero bets $28, CO raises $76 (All-In), Hero ?

What exactly are you afraid of in h1, I think you'll see AK here alot, though AQ is going to town you once and awhile of course. However you're getting a decent price on the river to look him up, I call.

For h2 It's possible he may have been waiting to raise the turn with a set but got scared that you wouldn't continue with worse with the flush draw completing. You said he snap shoved....and he's 11/7 calling your UTG raise..he has it.

1- This sucks. I think it's probably a fold but I call vs. a complete unknown. A few hands worth of nitty stats makes this a fold though.

2 - Snapfold. Is he the type of player to bluff here?

1-you should cont.bet on flop to see if he has something.
2-famous river card.You got flush and he?
Full house maybe.FOLD