The complete V3 souvenir list, and where to find them
01 passport
02 key1 (Key), Town Hall
03 key2 (Special Key), Town Hall
04 map (City Map), Town Hall
05 text book, School
06 computer, School
07 medal, School
08 cell phone, Parent
09 Bicycle (BMX), (Bicycle), Grandparent
10 skis, Travel (Switzerland)
11 palm tree, Travel (Hawaii)
12 surf board, Travel (Australia)
13 Panda bear, Travel (China)
14 maracas, Travel (Chile)
15 ring, King (5,000)
16 cape, King (12,000)
17 crown, King (30,000)
18 skateboard, Arcade claw game & ring toss game
19 baloon (balloon), Arcade claw game & ring toss game
20 baseball cap, Arcade claw game & ring toss game
21 teddy bear, Arcade claw game & ring toss game
22 Golden Tamagotchi, Mall toy store
23 rare disc (rare cd), Mall music store
24 rare shoes, Mall clothing store
25 poster1 (movie poster), Theatre "The Final Race"
26 poster2 (movie poster), Theatre "Androtchi's Birthday"
27 poster3 (movie poster), Theatre "Hide and Seek"
28 BANDAI (Bandai logo), Mall toy store
29 mic (microphone), Mall music store
30 suitcase, Mall clothing store
31 trophy, Arcade race game
32 famous picture *
* Note about the Famous Picture: You have to be on third generation, or higher.
On your first visit to the grandparent's house, you'll get a password for souvenir 9, the BMX Bicycle. Enter this password into your V3.
On your second visit to the grandparent's house, you'll get the password for a plant. Enter this password into your V3.
On your third visit to the grandparent's house you'll usually get the password for a fishing pole. However, rarely you will instead get a password for souvenir 32 - the famous picture. If you enter the fishing pole password into your V3, you can't get souvenir 32 with your current tamagotchi character, you'll have to wait at least until your next generation. The trick is to ignore the fishing pole password; do not enter it into your V3. Visit the grandparent's house again, and if you're lucky you might get the souvenir 32 password. If not, try yet again.
Now, having said all that, I and a few of my friends have gotten the souvenir 32 password from V3 Tamatown, but when we entered them into our V3 toys, we got fishing poles. That was a while ago, so maybe they've fixed the problem on Tamatown by now. If not, have a look at this topic for a cheat method that will allow you to get souvenir 32:
https://www.tamatalk.com/IB/index.php?showtopic=94139