BS,
i suggest you can enroll first la. Only $50 for whole period. if you can attend for more than 3-4 lessons. It is ok bor. from 16-27 July, may be you only miss 4 lessons. (twice per week)
My son attend the football course last summer at YMCA, it cost around $80-100 per lesson ka.
i also have some info. about the mini tennis course organize by Tennis association and LCSD, cost around $900 for 12 lessons within July/Aug 2007. if you are interest, pls let me know, i can't remember the website right now.