I did well at Christmas. Sadly the stuff on offer for Valentine's day is just **** really. Some rose bushes and a stall, none of which generate any cash or anything useful Will be glad when it's over and it returns to normal. Making me do all these 24 hour quests is boring as hell. The card system is broken too, certain friends only have 1 card and are left at 2/3. Annoying but hey, what can you do.
If you clear the wheel (I only need the train, ATM), you get a "Tunnel of Love" ride for your Krustyland, so more KL tickets. As to the cards, each character can only have one card at a time, so if your neighbour doesn't collect them, you can't leave more. Next "event" will probably be St Patrick's Day as per last year.