Most Agressive. Best passer. Most accurate. Sportsmanship. Hope this sparks some ideas(:

Best teammate. Hardest Worker.

for the u5 age group i would suggest all players get a simple certificate of participation. they will love it and won't make any of the players or parents upset with a certificate they may not appreciate. i know that sounds silly - but it happens quite often.

When mine were this age we did the "Team Certificate", Exp... Happiest team on the field Award, Best Passing Team, Best Smiles on the field. The parent made a big deal out of them and decorated frames for them in. This was also a great perent bonding activity. My kids are in high school and college now and still have their certificate on the wall...