J.,
I love the idea of a baby shower at a Tea Room. Little tea sandwiches and desserts and of course, hot and cold tea. It is really sweet, I love the coziness and the intimacy. There are a few tea rooms in the North Phoenix area. Some restaurants have a private dining room or even a patio/courtyard... prices vary though. As a party planner my best advice is to keep it in a cozy and intimate setting. I would not recommend a park if you are having more than a few guests...it's a lot of work...you would want tents, tables, linens, chairs. You'd have to lug stuff back and forth. Keep food cold, hot,....what about restrooms, etc. Remember to keep the comfort of your guests in mind. You're the host so you will want to be able to manage the flow of the party and ensure everyone is having a great time, especially the Mom-to-be. Don't forget to enjoy the joyous occassion. Don't overwelh yourself with too many details.
Have fun and enjoy your friendships!
Blessings!!