What are three top tennis camps for me?  Here are the constraints:  I want to 
go for a long weekend (leave on a Friday night, return on a Monday night, and 
I'd like to be able to get in a full day of tennis on the Monday).  I live in 
New York City.  I'm planning to go some weekend in May.  I'd like a camp in an 
attractive location.  I'd like the program to be heavy on instruction.  I'm an 
adult (36) and I'd like the other participants to be also.  I play at an 
advanced-intermediate level.  I am flexible about the cost of the camp, but I'd 
rather not pay an exhorbitant amount to travel there (i.e. total travel costs 
<$500).

Hi George!

Given the specifications you’ve listed, the top three camps are:

Gunterman Tennis School, Stratton Mountain Resort, Vermont: 
http://www.greattennis.com/
800-787-2886

Top Notch Tennis Academy, Stowe Resort, Vermont
: http://www.topnotch-resort.com/tennis/66.html
800-451-8686

Killington Tennis, Cortina Inn & Resort, Cortina, Vermont:  
http://www.killingtontennis.com/index.html
800-451-6108

Summary of programs:

Gunterman Tennis School
http://www.greattennis.com/
Adult weekend camps available in May
Typical camp runs Saturday to Sunday but you will be able to add on an 
additional day (Monday)  
5 hours of instruction per day
Ratio of student to instructor: 4:1
Average age of participants range from 30-45 years old
Classes are grouped based on ability
School located in scenic Green Mountains in Vermont
You can drive to Vermont thereby keeping travel costs low

Top Notch Tennis Academy
http://www.topnotch-resort.com/tennis/66.html
Adult weekend camps available in May
Typical camp runs Friday to Sunday however you can attend Saturday to Monday
5 hours of instruction per day (Saturday and Sunday), 3 hours of instruction 
(Monday)
Ratio of student to instructor: 4:1
Average age of participants range from 20-50 years old
Classes are grouped by ability
School located in scenic Green Mountains in Vermont
You can drive to Vermont thereby keeping travel costs low

Killington Tennis
http://www.killingtontennis.com/index.html
Adult weekend camps available in May
Typical camp runs Friday to Sunday however you can attend Saturday to Monday
5 hours of instruction per day
Ratio of student to instructor: 4:1
Average age of participants range from 20-60 years old
Classes are grouped based on ability
School located in scenic Vermont
You can drive to Vermont thereby keeping travel costs low

Each of the above schools has its own separate website with additional details 
regarding cost, lodging, meals, etc.  However, please note that I found the 
most information by calling each of the schools.

Additional information regarding adult tennis camps can be found at:   
http://tennis.shawguides.com/  
This appears to be a fairly comprehensive guide to tennis camps located 
throughout the US.  You may also narrow your search requirements within this 
site (e.g. adult camps located in the Northeast).  Also, this site links to 
Tennis Magazine’s Top 50 lists as well as pointers on how to prepare for tennis 
camp.  
The link to Tennis Magazine’s Top 50 Tennis Camps: Northeast/Canada is:
http://www.tennis.com/display.cfm?articleID=839 

Please note that my research indicates that a number of schools run Friday 
through Sunday and the lessons are progressive.  Therefore, to add an 
additional day onto an existing weekend program, you may be entering into a 
group that has already had 3 or more hours of instruction.  This may also 
result in the Monday lesson being out of order (e.g. videotaping done on Monday 
rather than the first day of class) or repetitive.  Therefore, if you have any 
flexibility regarding travel days, you may want to consider Thursday to Sunday 
as your long weekend.

I found this information by using the search terms 

adult tennis camp new york city
adult tennis camps northeast

George, I hope you find this information useful and enjoy tennis camp!

Good content very nicely presented.  Extra web links very helpful.  Thank you!