.Top 5 for me (I never owned an N64 but my mate did)
Goldeneye - spent weeks playing this it was incredible
Mario 64 - I was blown away playing this for the first time although I remember buying Tomb Raider 2 for my PS1 and thinking it looked better
Mario Kart 64 - Again like most enjoyed the endless multiplayer on this
Blast Corps - Tremendous; original game - actually forgot Rare did this until it popped up in the recent Rare Replay compilation
Body Harvest - DMA Design (now of GTA / Rockstar North fame) - great game fighting aliens but you could swap vehicles
Goldeneye my all time favourite,
Have you played any of those games recently?
Its good and fun! Brings back so many memories.